International Journal of Academic Research in Business and Social Sciences October 2011, Vol. 1, No. 3 ISSN: 2222-6990 456 www.hrmars.com/journals Reforming Basic Science Teaching and Learning In Primary Schools Through Mutual Team Teaching: A Study of Oyo East Local Government Area of Oyo State Bolaji, O.A Emmanuel Alayande College of Education, Oyo School of Education, General Studies Department E.mail: akinik1@yahoo.com Adesina, A.E Emmanuel Alayande College of Education, Oyo School of Education, General Studies Department E.mail: adexezek44@yahoo.com Abstract This paper discusses an innovative programme of team-teaching in primary schools of Oyo East Local Government Area of Oyo State; Nigeria. First it analyses the way in which the scheme has evolved from previous experiences. Then, sampled 240 primary five pupils of forty (40) pupils in six intact classes, the classes were randomly allotted to the treatment (Team-teaching) and control (Conventional method) using pre-test-post- test control group, quasi experimental deign. A 40 items Basic Science Achievement Test (BSAT) validated and having reliability value of 0.72 was administered to the six classes before and after the treatment and the scores obtained were analysed using Analysis of Covariance (ANCOVA). The findings revealed that pupils taught with team teaching performed significantly better than those on conventional method in Basic Science (F-Ratio = 437.47, F-Critical (0.05) = 4.00, df = 1,235). It was therefore recommended among others that Basic Science Teachers in primary schools should engage pupils with mutual team-teaching strategy. Keywords: Basic Science, Teaching, Learning, Mutual Team-Teaching Introduction Learning is a function of teaching. It involves the acquisition of manipulative skills, intellectual as well as social competencies and habits. There are different categories of learning ranging from very simple (conditioning) to the complex learning by man (insightful learning, observational learning). Generally, learning involves a