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Research Article | Volume 5 Issue 2 (July-December, 2025) | Pages 1 - 9
Employing Concurrent Engineering and Reverse Logistics Techniques to Reduce Costs and Enhance Product Quality
 ,
 ,
1
Department of accounting, College of Administration and Economics, University of Wasit, Wasit, Iraq
Under a Creative Commons license
Open Access
Received
May 29, 2025
Revised
July 22, 2025
Accepted
Aug. 7, 2025
Published
Sept. 15, 2025
Abstract

This study seeks to analyze how the joint deployment of concurrent engineering and reverse logistics chains contributes to cost reduction and product-quality improvement. An analytical-descriptive methodology is adopted, combining a review of relevant literature with available quantitative and qualitative data to interpret the phenomenon under investigation. The research explains how applying concurrent-engineering principles curtails waste and shortens development and production cycles, while reverse logistics recovers value from returned or end-of-life products and reinserts it into the production process, thereby supporting both economic and environmental sustainability. The study also highlights the integration of these two approaches as an effective strategy for securing competitive advantage by balancing lower operating costs with higher quality levels that align with customer requirements and global quality standards. The chief finding is that the coordinated use of concurrent engineering and reverse logistics markedly reduces costs and enhances quality.

Keywords
INTRODUCTION

Cost reduction and product-quality enhancement rank among the foremost priorities of industrial enterprises in Iraq and worldwide, especially amid rapid global market shifts and tightening environmental requirements. Within the spectrum of modern manufacturing philosophies, concurrent engineering has emerged as an approach that synchronizes design, manufacturing, and quality-assurance activities within a cross-functional team, enabling shorter product-development cycles and swifter responses to demand fluctuations. Conversely, the reverse logistics chain constitutes a logistics system devoted to retrieving used or surplus products and channeling them into reuse, remanufacturing, or recycling, thus providing an alternative source of materials and minimizing waste.

 

The integration of these two pathways forms a feedback loop that begins at the design stage and extends beyond recycling to regenerate product value and bolster resource sustainability. Such integration opens new horizons for Iraqi factories to adopt circular business models that reconcile competitive imperatives with sustainable-development agendas. It offers domestic production units a genuine opportunity to lessen dependence on imported materials by maximizing the use of local resources and recycled products.

 

Accordingly, this research is significant in that it aims to establish an applied framework enabling national factories to deploy concurrent-engineering concepts and reverse logistics chains in an integrated manner suited to the particularities of Iraq’s industrial environment. The proposed framework aspires to raise operational efficiency, improve product quality, and reduce overall costs.

MATERIALS AND METHODS

Research Problem

Despite the global shift toward concurrent-engineering techniques and reverse-logistics solutions, many local economic units are still managed with a traditional mindset that relies on sequential design and production and maintains linear supply chains incapable of recovering value after consumption. Failure to keep pace with the modern business environment has markedly increased total product cost and eroded quality and reliability, while squandering opportunities for recycling and waste reduction. The research problem, therefore, lies in the inability of these units to integrate concurrent-engineering methods with reverse-logistics systems, a shortcoming that weakens their competitiveness, limits cost reduction, and constrains product-quality improvement. The central question becomes: To what extent does the joint application of concurrent engineering and the reverse-logistics chain reduce total costs and enhance product quality within industrial units?

 

Research Objective

This study aims to measure and analyze the effect of combining concurrent-engineering principles with reverse-logistics practices on lowering total costs and improving product quality in the industrial units under investigation, while determining both the magnitude and statistical significance of that effect.

 

Research Hypothesis

The study is guided by a principal hypothesis: integrating concurrent-engineering techniques with reverse-logistics systems produces a statistically significant impact—namely, a reduction in total product cost and an improvement in field performance quality—compared with adopting either approach in isolation within industrial units.

 

Research Significance

The study addresses a clear knowledge gap: the scarcity of research that unites, within a single framework, the proactive design-stage nature of concurrent engineering and the post-sale, remedial nature of reverse logistics. Conventional studies typically examine each technique separately—either focusing on shortening the development cycle or on managing returns—without showing how the early incorporation of disassembly and remanufacturing requirements into parallel work teams can create a circular life cycle that yields greater financial savings and sustained qualitative improvements in product quality. Accordingly, this research fills a pivotal void in the literature and opens fertile ground for future studies.

 

Research Method

The study adopts the descriptive-analytical method as the most appropriate means of diagnosing the current adoption of concurrent-engineering and reverse-logistics practices and of evaluating their impact on cost reduction and product-quality improvement in a local industrial context. To measure these variables, the researchers developed a closed, five-point Likert-scale questionnaire grounded in well-established academic measures.

 

Data and Information Sources

The study includes a systematic review of up-to-date scholarly literature on concurrent engineering, reverse logistics, and their combined role in cost reduction and quality improvement within a circular-economy framework, thereby strengthening the theoretical foundation and supporting interpretation of the field results.

 

Theoretical Background

Literature Review

Recent scholarship has investigated the relationship between adopting concurrent engineering and enhancing product quality from multiple angles. In a field study of 315 employees across eight Jordanian manufacturing plants, Malkawi and Ali [1] confirmed the decisive role of concurrent-engineering dimensions—parallel design, process integration, and supply-chain alignment—in elevating total-quality indices. They observed that the effect grows stronger as digital transformation deepens and as the system can relay test and field-service data to development teams in real time; this was reflected in a 27 % increase in first-pass yield and a 20 % reduction in rework hours within six months of implementation.

 

In the aviation sector, Duverger et al. [2] demonstrated that embedding a “digital thread” within a concurrent-design environment enables immediate processing of structural and vibration-analysis results, reducing early structural defects by 15 % and accelerating final-model approval by two weeks compared with the planned schedule, while generating tangible savings in downstream modification costs.

 

Tuama [3] examined an Iraqi textile mill that integrated life-cycle analytics into a concurrent-design team. The study found a 22 % decline in manufacturing errors and greater stability in fabric properties—especially post-wash shrinkage—after early adjustments to the fiber blend based on quality tests conducted in parallel with the engineering-model preparation, thereby boosting local-market acceptance.

 

In a mechanical assembly-line study, Al-Msary et al. [4] reported that reorganizing operations along parallel-assembly principles—while embedding critical-function tests at early checkpoints—cut rework hours by 18 % and raised the Sigma level from 3.2 to 3.9. The authors attributed this improvement to the early integration of maintenance and quality-control departments with design engineers.

 

Finally, Rismiller et al. [5] employed a multi-agent simulation to assess “solution-set-based concurrent engineering.” Their model showed that running parallel design paths within broad solution spaces reduces late redesign by 30 % and improves functional compatibility by enabling concurrent testing of alternative design options before progressively narrowing the field.

 

Concurrent Engineering: Definition

Concurrent Engineering (CE) is an integrative methodology that conducts product-design activities, process design, quality assurance, and supply-chain planning in parallel from the earliest development stages, rather than treating them sequentially in the traditional manner. Sohlenius characterizes CE as “a strategic ambition to boost competitiveness by shortening development time while simultaneously improving quality and lowering cost,” relying on cross-functional teams that operate within a shared information environment in which representatives of design, manufacturing, marketing, suppliers, and customers participate in decision-making from the outset [6].

 

Strategic Importance of Concurrent Engineering

CE serves as a strategic tool that enables an economic unit to align design, manufacturing, and service decisions along a single time line, thereby combining speed, efficiency, and quality within an integrated operational framework. Its principal strategic benefits include:

 

  • Faster Time-to-Market — Parallel work shortens the development cycle by 30–50 % compared with conventional methods, expanding market share for new products [7].

  • Lower Total Cost — Early involvement of manufacturing and supply-chain teams exposes production problems before they occur, avoiding costly late changes and yielding savings of up to 20 % of the final product cost [8].

  • Enhanced Quality and Reliability — Embedding quality requirements in the design stage builds quality at the source and reduces returns and field failures [6].

  • Greater Innovation and Market Responsiveness — Early collaboration with stakeholders—especially customers—produces closer alignment between product attributes and customer preferences, creating a competitive edge based on simultaneous speed and differentiation [9].

  • Support for Sustainability and Added Value — Implementing a sustainability-driven CE model in the Mexican textile industry cut material waste by 12 % and energy consumption by 8 % during product development [10].

 

Concurrent vs. Sequential Engineering

Putnik and Putnik [11] explain that Sequential Engineering proceeds along a clear linear path: idea generation, then distinct phases of design, manufacturing, and testing. This elongates feedback loops and magnifies the cost of late modifications. By contrast, Concurrent Engineering intentionally overlaps these activities within a cross-functional team working in a shared information environment, shortening development time, reducing rework, and improving product quality through “real-time decision integration” among design, manufacturing, and quality functions [11].

 

Principles of Concurrent Engineering

Responding to pressures to compress life cycles and cut cost without sacrificing quality or innovation, CE developed as an integrated product-development model. Prasad [12] formulated seven enabling principles—derived from a full-vehicle development case study and other industrial settings—that provide a systematic foundation for CE in modern manufacturing units:

 

  • Parallel Work-Group Principle: Establish cross-functional teams from project inception, allowing product designers, process engineers, quality representatives, and suppliers to work in overlapping streams with short feedback loops. In Prasad’s study, this arrangement reduced development time for critical components from 22 weeks to fewer than 4.

  • Parallel Product-Decomposition Principle: Use Design Structure Matrices (DSM) or network-analysis tools to break the product and process architecture into quasi-independent modules that can be developed concurrently while controlling their interfaces, enabling safe synchronization and lowering late-stage integration risk.

  • Concurrent Resource-Scheduling Principle: Plan human and physical resources so they are available precisely when needed in each parallel stream. Backward scheduling and linear-programming techniques minimize bottlenecks, while stage-gate decision points keep the plan current without halting parallel work.

  • Concurrent Processing Principle: Run design, engineering verification, and manufacturing activities in overlapping timeframes rather than strict sequence. High-fidelity digital twins and knowledge bases support rapid simulation and verification before moving to physical prototypes, reducing iterations of “build-test-modify.”

  • Minimize-Interfaces Principle: Reduce architectural and organizational touchpoints by designing modular units and integrating databases. Fewer open interfaces mean fewer integration errors and less coordination time. In the vehicle case, merging mechanical and electronic databases cut interface-related defects by 15 %.

  • Transparent-Communication Principle: Create a unified data dictionary and electronic data-exchange platform (such as cloud-based PLM or EDI) to provide real-time information flow to all stakeholders, ensuring consistency of engineering releases, preventing conflicts from isolated updates, and supporting end-to-end requirement traceability.

  • Quick-Processing and Decision Principle: Shorten pre- and post-activity setup times by employing high-productivity knowledge tools—object-oriented modeling, rule-based design—and high-bandwidth computing frameworks. This environment allows development teams to react swiftly to market changes and emergent engineering requirements without disrupting other parallel streams.

 

Strategic Benefits of Concurrent Engineering

Concurrent Engineering (CE) is an integrative framework aimed at shortening product-development cycles, reducing costs, and elevating quality without sacrificing innovation. Its principal benefits are clarified below:

 

  • Shorter Development Cycle and Earlier Market Entry Parallel work in CE produces a tangible reduction in product-development time: American electronics firms recorded a 40 % decrease in full-cycle duration after adopting CE [7], while the construction sector achieved roughly a 25 % schedule reduction through the same approach [13]. A recent study in the aviation industry likewise showed that embedding a “digital thread” within a concurrent environment trimmed two weeks from each design cycle [14].

  • Life-Cycle Cost Reduction Early involvement of manufacturing and supply-chain teams curbs late changes and rework. A sustainability-oriented CE model in a Mexican textile plant saved 22.9 % of annual material costs and cut material waste by 39.4 % [10]. Likewise, employing CE to redesign an Iraqi assembly line reduced operating time by 16.8 % and generated yearly savings estimated at USD 3.9 million [4].

  • Improved Quality and Reliability In CE, quality assurance is embedded in early design, decreasing field defects and enhancing product reliability; post-production defects fell by 30 % in a European home-appliance plant after CE implementation [15]. A survey of 244 U.S. manufacturers also found a positive link between integrated development and higher competitive-quality capabilities [8].

  • Enhanced Collaboration and Information Flow Product-lifecycle-management (PLM) platforms and shared data dictionaries provide transparent communication across departments. A UAE-based survey showed that CE adoption improved functional integration and customer satisfaction while reducing late design changes by 18 % [16]. The Mexican case cited earlier recorded a 35 % drop in problem-solving time between teams [10].

  • Faster Innovation and Customer Responsiveness The “Agile–Concurrent hybrid” framework indicates that merging Scrum cycles with parallel streams cuts customer-feedback response time by roughly one-third [9]. Recent work also shows that combining agile management and artificial intelligence within CE accelerates innovation and broadens sustainable design options [17].

  • Lower Risk, Fewer Errors, and Less Rework Well-managed activity overlap reduces the likelihood of late-stage errors: Eldin [13] reported a 20 % decline in design errors, while the Iraqi assembly-line project reduced bottlenecks by 165 minutes per production cycle [4].

  • Environmental Sustainability and Waste Reduction Embedding sustainability criteria from the outset lowers material and energy usage: the Mexican example cut energy consumption by 8 % in addition to reducing waste. Recent reviews confirm that combining CE with circular principles lengthens product life and reduces waste streams [17].

  • Higher Competitiveness and Financial Returns Savings in time, cost, and quality translate into improved market and financial metrics. Products launched faster than competitors gained a 12 % market-share increase [7], and operating profitability rose by four percentage points within one year of CE deployment [15].

 

Reverse Logistics Chain: Concept, Characteristics, and Benefits

Modern supply chains increasingly face the challenge of balancing economic efficiency with environmental responsibility. Because traditional linear flows do not reinvest the latent value of consumed products, the reverse logistics chain has emerged as a strategic tool for maximizing recovered materials, reducing waste, and improving organizational resilience in volatile markets. Beyond lowering environmental impact, reverse logistics generates new revenue streams and strengthens customer relations through more transparent and effective return policies [18].

 

Concept of the Reverse Logistics Chain

A reverse logistics chain encompasses the logistical activities that begin at the final consumer and aim to move products—or their components—back to any previous link in the chain for recovery, reuse, remanufacturing, or recycling [19]. Contemporary definitions emphasize two integrated dimensions: the reverse flow of materials to reclaim physical value and the reverse flow of information to track every returned item and decide the optimal treatment in real time [20].

 

Core Characteristics of the Reverse Logistics Chain

 

  • Reverse Material Flow The process starts at the point of consumption, where used products are collected and sent to sorting or consolidation centers before being directed to remanufacturing facilities or recycling plants—realigning the logistics architecture in the opposite direction of the forward supply path [19].

  • Operational Complexity and Return-Condition Variety Returned items vary widely in type, quantity, and condition, necessitating multiple layers of sorting and inspection. Sivasankaran [18] describes this complexity as a “dual challenge of operations and inventory” that requires precise classification models to avoid cost overruns from misestimation.

  • Real-Time Data Integration Enabled by Tracking Technologies  Modern reverse chains rely on tracking platforms built on the Internet of Things and RFID tags, allowing data to flow with the product at every stage. Real-time integration enhances decision accuracy and speeds response [20].

  • Value Recovery and Return Maximization The chief success metric is the ratio of recovered value to total cost. Recent studies show that remanufacturing can save manufacturers about 15 % of raw-material costs while reducing end-of-life disposal expenses [21].

  • Sustainability as a Strategic Driver Economic units face regulatory mandates and consumer pressure to adopt eco-friendly practices. Evidence indicates that firms’ performance on environmental and social sustainability indices clearly improves when an effective reverse-logistics program is in place, positively affecting reputation and market valuation [22].

 

Employing Concurrent Engineering and Reverse Logistics to Reduce Costs and Improve Product Quality

Deploying Concurrent Engineering (CE) alongside Reverse Logistics (RL) represents a strategic pathway to building an ideal product life-cycle that simultaneously secures financial savings and enhances quality. CE shortens the interval between design and production through parallel work among design, manufacturing, and quality teams, whereas RL focuses on returning products after use to recover their value or dispose of them responsibly. Combining the two methods establishes a closed feedback loop that begins early in the design phase and extends well beyond the point of sale, thereby reducing waste along the chain and increasing product reliability (Swink, 1998).

 

  • Design Optimisation for Ease of Recovery
    Parallel work allows after-sales service specialists and recycling-centre staff to participate in the development team from day one, embedding disassemblability and remanufacturability into the product’s core specifications. A recent industrial study found that incorporating early disassembly criteria reduced product tear-down time by 30 % upon arrival at the RL centre and generated tangible labour and handling savings [19].

  • Life-Cycle Cost Reduction
    Concurrent, RL-oriented design makes it possible to reuse standard components, limit material diversity, and rely on upgradable modules rather than full replacement. An integrated “digital-thread” framework in the aviation sector documented an 18 % drop in late modification costs by linking field-performance data directly to the design platform, enabling rapid corrective decisions before defects escalated [4].

  • Enhanced Product Quality and Reliability
    The return stream yields rich data on actual failure patterns and real-world operating conditions; those data feed directly into the concurrent-development cycle and demonstrably lower field-defect rates. In effect, the RL chain becomes a permanent field laboratory that supplies CE teams with reliable indicators for design improvement [20].

  • Greater Operational Flexibility and Lower Risk
    Joint deployment allows inventory to be shared between forward and reverse flows, creating an “alternative stock” of refurbished spare parts. This lowers dependence on external suppliers and prices in the risk of supply disruption. An architectural model implemented in high-tech plants showed that integrating concurrent planning with remanufacturing units cut inventory costs by 12 % and shortened emergency-maintenance response times [23].

  • Sustainability as a Source of Competitiveness

  • When CE and RL converge within a circular-economy approach, benefits extend beyond cash savings to include an improved brand image and a stronger competitive position. A comparative analysis in the textile industry concluded that firms running return programmed supported by concurrent design achieved higher customer satisfaction than rivals following a purely linear model [24].

 

Section three — Empirical Part

Building on the theoretical insights into CE and RL and their role in cost reduction and product-quality enhancement, this empirical section translates those concepts into practice. The study selected the Battery Plant of the State Company for Automotive and Equipment Industries—founded in 1975—as a national industrial cornerstone. The plant manufactures lead–acid batteries and operates an advanced line producing sealed maintenance-free batteries at an annual capacity approaching half a million units. Its production structure comprises three integrated sites:

 

  • Babel Assembly Facility

  • Lead Smelter in Khan Dhari

  • Al-Noor Dry-Battery and Support Services Plant

 

The organisation applies a rigorous quality-control system that includes Cold-Cranking Amperes (CCA) testing, charge/discharge cycles, and “magic-eye” indicators to ensure reliability. Production lines are equipped with high-efficiency air filters, and the company is launching a programme to recycle spent batteries in support of environmental sustainability. Expansion plans target AGM, EFB, and solar-storage solutions to increase local content, create jobs, and facilitate technology transfer.

 

To obtain field data, the researchers designed a comprehensive questionnaire that addressed the study’s core dimensions—namely, the level of CE and RL practice within the plant and their impact on product quality, operating-cost reduction, and customer satisfaction. The instrument was distributed to a purposive sample of 60 employees in production, management, maintenance, and quality departments; 55 usable responses were returned, yielding a high response rate that reinforces the robustness of the results. The data will be analysed with SPSS, employing appropriate statistical techniques to examine the strength of the relationship between CE/RL implementation and the plant’s cost-reduction and quality-enhancement outcomes.

 

Table 1: Distributed and Received Questionnaires

Questionnaires Distributed

Valid Questionnaires

Excluded / missing

Response Rate

60

55

3

92 %

Source: Prepared by the researcher using SPSS software.

 

This empirical investigation is intended to provide concrete evidence for how integrated CE and RL practices can drive both cost efficiency and superior product quality in the case-study plant.

 

Study-Instrument Design

The researchers employed SPSS as a ready-made statistical package to analyze the questionnaire data, with the aim of meeting the study objectives and testing its hypotheses. The analysis comprised the following steps:

 

  • Internal-Consistency Verification – ensuring each questionnaire item is consistent with the dimension to which it belongs, i.e., the item measures what it is intended to measure and nothing else. Pearson’s correlation coefficient was calculated between each item’s score and the total score of its corresponding dimension.

  • Construct-Validity Verification – confirming that each dimension accurately measures the targeted theoretical concept by testing the internal coherence of the questionnaire’s structure.

  • Cronbach’s Alpha Calculation – assessing the level of internal consistency for the items within each dimension; an α value approaching 1 indicates high homogeneity and reliability, whereas a value near 0 signals weak consistency and instability.

  • One-Sample t-Test – evaluating whether to accept or reject the study hypotheses by comparing calculated t values with the critical value at the 0.05 significance level. The same test was applied to each item individually to determine its statistical relevance.

  • Descriptive statistics (mean, standard deviation, frequency distribution) were also used to describe respondents’ answers and observe their trends.

  • A five-point Likert scale was adopted to code responses, allowing data entry and conversion into numerical values suitable for statistical analysis.

  • The following two tables show the strength of the correlation between each item and the total score of its dimension, demonstrating how much each statement contributes to explaining its intended theoretical construct.

 

Table 2: Internal-Consistency Validity for Dimension 1 (Concurrent Engineering and Reverse Logistics Practices)

No.

Item

Correlation Coefficient

Sig. (2-tailed)

1

Design and manufacturing teams collaborate concurrently from the earliest stages of product development.

0.792

0.000

2

Digital prototypes are used regularly during product development.

0.791

0.000

3

The purchasing department is integrated into the early stages of product development.

0.803

0.000

4

Quality tests are conducted in parallel with design activities.

0.740

0.000

5

Manufacturing risks are reviewed during the design phase, not afterward.

0.768

0.000

6

Our facility has a systematic program for retrieving products at the end of their service life.

0.854

0.000

7

Returned products are processed for reuse or remanufacturing.

0.781

0.014

8

Data from returned products are integrated into the design of new products.

0.811

0.000

9

Quality checks are performed on remanufactured parts before reuse.

0.747

0.000

10

The organization offers incentives to customers to return used products.

0.840

0.000

Source: Prepared by the researcher using SPSS software

 

Table 3: Internal-Consistency Validity for Dimension 2 (Cost Reduction and Product-Quality Improvement)

No.

Item

Correlation Coefficient

Sig. (2-tailed)

1

Direct material costs have declined in our facility over the past twelve months.

0.828

0.000

2

Rework and repair costs have decreased compared with the previous year.

0.844

0.000

3

Inventory costs have contracted during the past year.

0.793

0.000

4

Return rates have fallen during the past twelve months.

0.802

0.000

5

Our product quality rating under third-party audits has improved.

0.710

0.000

6

Return on investment in product-development projects has risen.

0.735

0.000

7

Customer satisfaction with final-product quality has improved.

0.712

0.000

8

Production-line scrap rates have decreased during the past year.

0.830

0.000

9

Tangible annual savings in operating costs have been achieved.

0.728

0.000

10

Time-to-market has accelerated in recent years without sacrificing quality.

0.650

0.000

Source: Prepared by the researcher using SPSS software

 

Table 4 - Construct Validity Matrix for Questionnaire Dimensions

Dimension

Correlation Coefficient

Sig. (2-tailed)

Concurrent Engineering & Reverse Logistics

0.699**

0.000

Cost Reduction & Quality Improvement

0.634**

0.001

Source: Prepared by the researcher using SPSS software

 

Table 5: Cronbach’s Alpha Reliability

Cronbach’s Alpha

Number of Items

0.858

20

Source: Authors’ compilation based on SPSS output

 

Table 6: Normality Tests

Variable

K–S Statistic

Sig.

S–W Statistic

Sig.

n

CE & RL Practices

0.107

0.177

0.972

0.219

55

Cost Reduction & Quality

0.113

0.075

0.959

0.058

55

Source: Prepared by the researcher using SPSS software

 

Table 7: One-Sample t-Test for Dimension 1 Items (Concurrent Engineering and Reverse Logistics Practices)

Item

t

df

Sig. (2-tailed)

Mean Difference

Design and manufacturing teams collaborate concurrently from the earliest stages of product development.

38.022

54

0.000

3.78182

Digital prototypes are used during product development.

40.666

54

0.000

3.81818

The purchasing department is integrated early in product development.

32.740

54

0.000

3.69091

Quality tests are conducted in parallel with design activities.

40.290

54

0.000

3.65455

Manufacturing risks are reviewed during the design phase rather than afterward.

43.802

54

0.000

3.76364

Our facility has a systematic program for retrieving products at end of life.

35.425

54

0.000

3.61818

Returned products are processed for reuse or remanufacture.

35.323

54

0.000

3.67273

Data from returned products are integrated into the design of new products.

40.909

54

0.000

3.78182

Remanufactured parts undergo quality testing before reuse.

39.172

54

0.000

3.67273

The organisation offers incentives to customers to return used products.

34.593

54

0.000

3.81818

Source: Prepared by the researcher using SPSS software

 

Table 8:  One-Sample t-Test for Dimension 2 Items (Cost Reduction and Product-Quality Improvement)

Item

t

df

Sig. (2-tailed)

Mean Difference

Direct material costs have decreased in our facility over the past twelve months.

37.874

54

0.000

3.89091

Rework and repair costs have fallen compared with the previous year.

38.008

54

0.000

3.92727

Inventory costs have shrunk during the past year.

41.381

54

0.000

3.83636

Return rates have declined over the past twelve months.

42.315

54

0.000

3.81818

Our product-quality rating under third-party audits has improved.

38.589

54

0.000

3.80000

Return on investment in product-development projects has increased.

43.201

54

0.000

4.03636

Customer satisfaction with final-product quality has improved.

43.958

54

0.000

3.85455

Scrap rates on production lines have decreased during the past year.

40.666

54

0.000

3.81818

Tangible annual savings in operating costs have been achieved.

39.118

54

0.000

3.85455

Time-to-market has accelerated in recent years without sacrificing quality.

45.061

54

0.000

3.83636

Source: Prepared by the researcher using SPSS software

 

Table 9: Correlation Matrix for Hypothesis Test

 

Cost Reduction & Quality

CE & RL Practices

CE & RL Practices

 

1

0.786**

Sig. = 0.001

Cost Reduction & Quality

0.786**

1

Sig. = 0.001

Notes: Correlation is significant at the 0.01 level (two-tailed), Source: Prepared by the researcher using SPSS software

 

Statistical analysis shows that all practice items display strong correlations with their total dimension scores (r = 0.740–0.854) and high statistical significance (Sig. ≤ 0.014). Most coefficients exceed 0.80, reinforcing the premise that the ten items measure a single homogeneous construct representing the adoption of concurrent-engineering and reverse-logistics practices. Table 2

 

Correlation values between 0.650 and 0.844 (all at Sig. = .000) indicate excellent validity and reliability for this dimension. The highest coefficients (≥ 0.80) underscore that direct cost-reduction indicators form the core of the dependent variable, while item 10—though comparatively lower—still exceeds the acceptable threshold and enriches the measure with a time-to-market perspective. Table 3

 

Construct Validity

Pearson’s r = 0.699 (p< 0.001) signifies a strong positive relationship, explaining roughly 49 % of variance in outcomes (r² ≈ 0.49). Table 4

 

Cronbach’s Alpha Reliability Test

An alpha of 0.858 exceeds the commonly accepted threshold (≥ 0.70), indicating high internal consistency and strong measurement reliability. Table 5

 

Normality Tests

For both Kolmogorov–Smirnov and Shapiro–Wilk tests, p > 0.05, indicating no significant deviation from normality and validating the use of parametric procedures. Table 6

 

One-Sample t-Test

A one-sample t-test was conducted to assess the statistical significance of respondents’ answers to each questionnaire item. An item is considered positive—that is, accepted by respondents—when at least one of the following conditions is met:

 

  • The calculated t value exceeds the critical value (2.01) at the appropriate degrees of freedom and a significance level of α = 0.05.

  • The p-value (Sig.) falls below 0.05 and the item’s relative importance exceeds 60 %.

  • Conversely, an item is considered negative—that is, not accepted—if the calculated t value is below 2.01 or the p-value exceeds 0.05 and the relative importance is below 60 %.

 

Based on these rules, the main research hypothesis was formulated as follows:

 

  • Integrating concurrent-engineering techniques with reverse-logistics practices produces a statistically significant effect—namely, lower total product cost and better field performance quality—compared with adopting either approach in isolation within industrial units.

  • The one-sample t-test therefore serves as the statistical foundation for verifying this hypothesis by comparing observed means with the theoretical mean and determining whether the differences are statistically significant, as shown in Tables 7 and 8.

 

The one-sample t-test results for the ten practice items show that all p-values (.000) are well below the adopted significance level (α = 0.05), and all calculated t values—from 32.740 to 43.802—greatly exceed the critical value (2.01). Statistically, this indicates substantial differences between sample means and the theoretical mean. The average mean difference of roughly 3.7 points reveals strong agreement among respondents regarding the implementation of these practices; the highest values were recorded for “regular use of digital prototypes” and “providing customer incentives for product return” (3.818), followed by “concurrent collaboration between design and manufacturing” and “integration of return-stream data into design” (3.782). These findings reflect broad consensus that the organisation applies functional integration and reverse-logistics practices at a high level, supporting the dimension’s validity. Table 7

 

The one-sample t-test shows that all performance-related items are statistically significant at α = 0.05: calculated t values range from 37.87 to 45.06—far above the critical value (2.01)—and all p-values are below .001. Mean differences (3.79–4.04) indicate strong respondent agreement, representing 76–81 % of the maximum score on the five-point Likert scale. Respondents perceive clear gains in reduced material, rework, inventory, and scrap costs, higher ROI, faster time-to-market, and improved customer satisfaction. These outcomes reinforce the credibility of the hypothesis that the operational practices under investigation translate into concrete, positive cost and quality results. Table 8

 

Hypothesis Testing

Pearson’s r = 0.786 (Sig. = 0.001) indicates a strong positive relationship between CE/RL practices and cost-and-quality performance, supporting the principal hypothesis that integrating concurrent engineering and reverse logistics leads to significant cost savings and quality enhancement.

 

These statistical findings collectively substantiate the study’s main hypothesis: employing a synergy of concurrent engineering and reverse logistics constitutes a genuine operational lever for cost reduction and product-quality improvement.

CONCLUSION
  • Integrating concurrent engineering with reverse-logistics practices produces a marked reduction in costs and a noticeable improvement in product quality.

  • The questionnaire instrument demonstrates a high degree of reliability and validity, which makes its results trustworthy and actionable.

  • The practices examined enable the plant to lower material and scrap costs and to raise its return on investment.

  • Design and manufacturing teams collaborate from the earliest stages and make effective use of digital prototypes.

  • The product-return system operates efficiently and contributes to lower inventory levels and inventory costs.

  • The dataset follows a normal distribution, allowing for deeper parametric analyses in future research.

 

Recommendations

  • Maintain stable cross-functional teams that consistently include design, manufacturing, quality, and supply representatives.

  • Connect data from returned products directly to design platforms by deploying smart-tracking technologies.

  • Design products so they can be disassembled easily and their components remanufactured.

  • Offer incentives to customers and suppliers to return used products.

  • Regularly track key performance indicators—such as development lead time, full life-cycle cost, and the percentage of materials recovered.

  • Implement comprehensive, recurring training programs for employees that focus on concurrent-engineering and reverse-logistics concepts and techniques, including hands-on workshops, accredited short courses, and interactive online modules.

REFERENCE
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  2. Duverger, E., et al. “Early Concurrent Engineering in the Aerospace Industry Supported by a Digital Thread Framework.” IFAC-PapersOnLine, vol. 58, no. 19, 2024, pp. 510–515. https://doi.org/10.1016/j.ifacol.2024.09.263.

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  7. Swink, M.L. “A Tutorial on Implementing Concurrent Engineering in New Product Development Programs.” Journal of Operations Management, vol. 16, no. 1, 1998, pp. 103–116. https://doi.org/10.1016/S0272-6963(97)00018-1.

  8. Koufteros, X.A., et al. “Integrated Product Development Practices and Competitive Capabilities: The Effects of Uncertainty, Equivocality, and Platform Strategy.” Journal of Operations Management, vol. 20, no. 4, 2002, pp. 331–355. https://doi.org/10.1016/S0272-6963(02)00018-9.

  9. Žužek, T., et al. “A Framework for the Agile-Concurrent Hybrid in Product Development.” Concurrent Engineering, vol. 28, no. 4, 2020, pp. 275–289. https://doi.org/10.1177/1063293X20958541.

  10. Aguilar-Virgen, Q., et al. “Concurrent Engineering Model for the Implementation of New Products in the Textile Industry: A Case Study.” Applied Sciences, vol. 11, no. 8, 2021, p. 3584. https://doi.org/10.3390/app11083584.

  11. Putnik, G.D., and Z. Putnik. “Defining Sequential Engineering (SeqE), Simultaneous Engineering (SE), Concurrent Engineering (CE) and Collaborative Engineering (ColE): On Similarities and Differences.” Procedia CIRP, vol. 84, 2019, pp. 68–75. https://doi.org/10.1016/j.procir.2019.07.005.

  12. Prasad, B. “Enabling Principles of Concurrency and Simultaneity in Concurrent Engineering.” Artificial Intelligence for Engineering Design, Analysis and Manufacturing, vol. 13, no. 3, 1999, pp. 185–204. http://dx.doi.org/10.1017/S0890060499133055.

  13. Eldin, N.N. “Concurrent Engineering: A Schedule Reduction Tool.” Journal of Construction Engineering and Management, vol. 123, no. 3, 1997, pp. 354–362. https://doi.org/10.1061/(ASCE)0733-9364(1997)123:3(354).

  14. Duverger, E., et al. “Early Concurrent Engineering in the Aerospace Industry Supported by a Digital Thread Framework.” IFAC-PapersOnLine, vol. 58, no. 19, 2024, pp. 510–515. https://doi.org/10.1016/j.ifacol.2024.09.263.

  15. Willaert, S.S., et al. “Collaborative Engineering: A Case Study of Concurrent Engineering in a Wider Context.” Journal of Engineering and Technology Management, vol. 15, no. 1, 1998, pp. 87–109. https://doi.org/10.1016/S0923-4748(97)00026-X.

  16. Santarisi, N. “Concurrent Engineering: Practice and Performance.” Proceedings of the 7th European IEOM Conference, 2024. https://doi.org/10.46254/EU07.20240231.

  17. Anyaora, S.C., et al. “Agile Project Management and Emerging Technologies in Concurrent Engineering for Sustainable and Collaborative Product Design.” Journal of Industrial Engineering & Management Research, vol. 6, no. 3, 2025, pp. 168–187.

  18. Sivasankaran, P. “Study on Reverse Logistics and Its Significant Importance – Review.” Acta Tecnología, vol. 10, no. 4, 2024, pp. 131–139. https://doi.org/10.22306/atec.v10i4.225.

  19. Sonar, H., et al. “Navigating Barriers to Reverse Logistics Adoption in Circular Economy: An Integrated Approach for Sustainable Development.” Cleaner Logistics and Supply Chain, vol. 12, 2024, p. 100165. https://doi.org/10.1016/j.clscn.2024.100165.

  20. Salas-Navarro, K., et al. “Reverse Logistics and Sustainability: A Bibliometric Analysis.” Sustainability, vol. 16, no. 13, 2024, p. 5279. https://doi.org/10.3390/su16135279.

  21. Mbago, M. “Implementing Reverse Logistics Practices in the Supply Chain.” Management Sciences & Credit Risk Analysis, vol. 15, no. 2, 2025, pp. 85–102. https://doi.org/10.1108/MSCRA-01-2025-0003.

  22. Khan, K.A., et al. “Reverse Logistics Practices: A Dilemma to Gain Competitive Advantage in Manufacturing Industries of Pakistan with Organization Performance as a Mediator.” Sustainability, vol. 16, no. 8, 2024, p. 3223. https://doi.org/10.3390/su16083223.

  23. Simons, R., et al. “A Reference Architecture for Reverse Logistics in the High-Tech Industry.” Computers & Industrial Engineering, vol. 194, 2024, p. 110368. https://doi.org/10.1016/j.cie.2024.110368.

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