Development and Validation of Automobile Diagnostic Simulation for Teaching Petrol Engine Maintenance in Technical Colleges
By Dr Arowolo, A.a et al
Uploaded by: Arowolo Ayoola
The purpose of this study was to develop and validate an Automobile Diagnostic Simulation (ADS) for teaching Petrol Engine Maintenance (PEM) in Technical Colleges. The study adopted the Research and Development (R and D) design articulated in four phases. In phase I, needs assessment was carried out to determine the software specification for ADS. In phase II, the Automobile Diagnostic Simulation was developed based on the findings from phase I. In phase III, the developed simulation was validated by subjecting the developed ADS to two stages of software testing (Alpha and Beta testing). In phase IV, the effect of the validated ADS was tested on students’ practical skills in diagnosing and repairs of the petrol engine. The study was carried out in Abuja (FCT) using the three Technical Colleges in Abuja. The population of the study was in two sets. One set of population was for the phase I of the study while the other was for the phase IV of the study. The population for phase I is 208 respondents, made up of 19 auto workshop supervisors, 47 software engineers, 10 MVMW teachers and 132 MVMW students. The population for phase IV is 132 respondents made up of 44 MVMW students in FSTC Orozo, 31 MVMW students in GSTC Kwali and 57 MVMW students in GSTC Garki. The sample size for the study was also in two sets. The sample size for phase I is 102 respondents. 20 percent of the population of MVMW students were randomly selected while the entire population of autoworkshop supervisors, software engineers and MVMW teachers were used. In phase IV, the sample size was 132. No sampling was carried out because intact classes were used in the three schools. Instrument for data collection was based on the phases involved in the study. The Software Requirement Specification Questionnaire (SRSQ) was used to collect data for phase I. In phase III, four instruments titled Computer Expert Validation Questionnaire (CEVQ), Educational Technology Expert Validation Questionnaire (ETEVQ), Subject Content Validation Questionnaire (SCVQ) and Students Personalised Response Validation Questionnaire (SPRVQ), were used in validating the developed ADS. In phase IV, two instruments titled Petrol Engine Diagnostic Skill Test (PEDST) and Petrol Engine Repair Skill Test (PERST) were used to test the effect of Automobile Diagnostic Simulation on students’ practical skills. The instruments were validated by five lecturers from the faculty of Vocational and Technical Education, University of Nigeria, Nsukka. The internal consistency of the questionnaires was determined and the Cronbach Alpha coefficient was 0.92,0.86, 0.73 and 0.81 respectively. The inter-rater reliability of PEDST and PERST was determined using Cohen Kappa coefficient to be 0.878 and 0.719 respectively. The three Technical Colleges were taught using three different methods. One group was taught using ADS as a stand-alone, the other group was taught using ADS with human tutor, while the third group was taught using the conventional method. Mean was used to answer the research questions while Analysis of Covariance (ANCOVA) was used to test the hypothesis at 0.05 level of significance. The findings of the study showed that 48 software specifications guided the design of ADS. The findings from Alpha and Beta testing also showed that ADS conformed to the specifications guiding its design. The result of testing the effect of ADS on students’ practical skills showed that ADS when used in collaboration with a tutor is more effective in learning diagnosis and repairs of the petrol engine. However, the conventional method was found to be more effective than when ADS was used as a stand-alone. Hence, ADS was recommended to be used to supplement the teaching of Petrol Engine Maintenance in the Technical Colleges and not a substitute to the use of human tutor in the classroom.
About the Authors
Dr Arowolo, A.a