iarjelIARJELIARJEL2708-5120https://doi.org/10.47310/iajel.2020.v01i02.014Differential Effectiveness of Bibliocounselling and Rational Emotive Behaviour Therapy in fostering Emotional Adjustment among In-school Adolescents in Edo State, NigeriaIluO. C.AdomehAugustaObosaIwenanogieThe differential effectiveness of Bibliocounselling [BC] and Rational Emotive Behavior Therapy [REBT] in fostering emotional adjustment among in-school adolescents in Edo State, Nigeria was the focus of this paper. Three hypotheses were formulated and tested in the study. The study adopted the quasi-experimental research design. The purposive random sampling technique was used to draw a sample of 45 participants consisting of 15 participants for the first treatment [BC], 15 for the second treatment [REBT] and 15 for the control group –Personal Hygiene/Teaching from a population of 1,783 of in-school adolescents. The kulvan’s [1] Emotional Adjustment Scale was adapted for the study. A total of five sessions (45minutes per session) was covered in both the treatment and control groups. The mean and standard deviation were used to answer the research question, while the Analysis of Covariance and the t-test for two independent sample means were used to test hypotheses at 0.05 level of significance. Although both treatment methods were effective in fostering emotional adjustment among in-school adolescents, the participants exposed to REBT showed more improvement over those exposed to BC. It was therefore recommended among others that counsellors should use more of REBT to help foster students’ emotions.