The purpose of this study was to develop a Computer-Aided instruction (CAI) for teaching Electrical and Electronic Devices at N.C.E. level in North Eastern Nigeria. A flowchart for the CAI was developed by describing the steps in words and representing them by symbols. Connections between events were represented by lines with arrowheads to show the direction or order in which they occur. The CAI was developed and written in visual Basic.Net (VB, NET) targeting the .Net framework 3.5. The user interface was developed using Windows Presentation Foundation (WPF). Procedural programming was used and the CAI was tested by using it to teach an experimental group (S1), while control group (S2) was taught using lecture method. The results obtained from the two groups were then compared. Two research questions and one null hypothesis guided the study. A population of 268 students was used. A total of 80 students formed the sample for the study. A purposive sampling technique was used. A researcher-made achievement test (RMAT) was used as instrument for data collection. The instrument was validated by five experts and pilot tested outside the study area in order to establish its reliability. Reliability coefficient of 0.92 was obtained for the RMAT. The mean was used to answer research question two. Z-test was employed to test the null hypothesis at 0.05 level of significance. Statistical package for Social Sciences (SPSS) version 17 was used for the data analysis. Results of the study revealed that there was variation between the mean scores of students taught Electrical and Electronic Devices at N.C.E. II level using CAI and students taught using lecture method. The null hypothesis was rejected, indicating that there was a significant difference between the mean achievement of students taught Electrical and Electronic Devices at N.C.E. II level using CAI and students taught Electrical and Electronic Devices at N.C.E. II level using lecture method. Students taught using CAI performed better than the students taught using lecture method. The CAI was found to be effective in teaching Electrical and Electronic Devices at N.C.E. II level. It was recommended that lecturers of electrical and electronics technology at N.C.E. level be encouraged to use CAI in teaching N.C.E. II Electrical and Electronic Devices.
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