Özet:

The study investigated the effect of two mode of Teacher’s Reflection on Junior Secondary School Students achievement in Basic Science. The pretest, posttest control group quasi- experimental design was adopted for the study. The sample was made up of 294 junior secondary students from four Junior Secondary Schools in Ibadan metropolis selected using stratified random Sampling technique. The operational guide for Reflection-in-action, Reflection-on-action and the conventional teaching strategies were developed and used.   Also, Basic Science achievement test was also developed and administered by the researcher. Data collected were analyzed using analysis of covariance and description statistics to test the hypothesis at P<0.05 The result shows that the two modes of reflection instructional strategies was more effective than the conventional instructional strategy. The student in Reflection-on-action group had significantly high mean score in achievement test  followed by those in reflection –in-action group  while the students in control group had the least It is, therefore recommended that the two mode of reflection should be practiced and used by the Basic Science teachers in order to help student gain more in achievement. In-service training programme need to be organized for the Basics Science Teachers to disseminate the effectiveness of reflection-in-action and reflection-on-action teaching strategy.

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