Ogunniran, V.OSURAJUDEEN, A. B2021-11-242021-11-242020-122384-7662https://uilspace.unilorin.edu.ng/handle/20.500.12484/6938Learners have different social and intellectual background, and not all the available materials can meet their needs and interest. The provision of locally produced instructional materials is a logical action for balancing activities among the different categories of learners. This study examines the difference between student-teachers and in-service teachers in the usage of improvised instructional materials in teaching senior school Yoruba language. Questionnaire vi>as employed to elicit data from the respondents. The population involved teachers of Yoruba in senior secondary schools in Qyq State, out of which 110 student-teachers and in-service teachers were sampled. The reliability of the instrument was established through the split-half reliability procedure where a value of 0.69 was obtained. Four research hypotheses were tested using the t-test. The results indicated that there was no significant difference in student-teachers and in-service teachers' perception of improvised instructional materials; there was no significant difference in student-teachers and in-service teachers' awareness of improvised instructional materials (df(108) t=.115, p > 0.05.); there was no significant difference in student-teachers and in-service teachers' production of improvised instructional materials; and there was no significant difference in student- teachers and in-service teachers' utilisation of improvised instructional materials in leaching senior school Yoruba in Oyo State. It was therefore recommended that both the student- teachers and in-service teachers of the Yoruba language should improvise instructional materials to arouse the senior students' interest in learning the subject.enImprovisationInstructional materialsLocal languageStudent-teachers