The effectiveness and efficiency of using Instructional Object Based Game (IOBG) in teaching and learning English language morphemes was investigated. Two research questions guided the study. The study was a pre and posttest equivalent control group design which employed a sample of 200 senior secondary schools 2 (SSS 2) students drawn from 20 co- educational schools within Lagos Island and Eti – Osa educational zones of Lagos state, Nigeria. Morphemes Instructional Object Based Games (MIOBG) and English Language Achievement Test (ELAT) were constructed and validated with coefficient of internal consistency of .89 and .86 respectively. Mean standard deviation and analysis of covariance (ANCOVA) were used to answer research questions. The findings showed that: MIOBG was found to be significantly more effective in facilitating teaching morphemes (in English language vocabulary building) than conventional (traditional) method of teaching. No significant difference existed between the performance of male and female students taught with MIOBG and conventional method. Suggestions were made by encouraging teachers in using games to teach.
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