June 26, 2011
June 26, 2011
June 29, 2011
K-12 & Pre-College Engineering and Engineering and Public Policy
22.1616.1 - 22.1616.8
A Re-Evaluation of the Teaching Design, Engineering, and Technology (DET) Instrument Background and Theoretical FrameworkTeaching design, engineering and technology (DET) is a Likert-scale self-report instrumentdesigned by Yasar and her colleagues (2006) to measure K-12 teachers’ perceptions of andfamiliarity with engineering. Since 2006, we have been using the DET instrument to gain criticalinformation regarding K-12 teachers’ perceptions of engineering and their familiarity withteaching DET. This information has then been used to provide a foundation for effectiveprofessional development for our K-12 teachers. MethodThis study aimed at re-evaluating and refining the DET instrument based on the sample data(N=405) collected from 2006-2010. Specifically, the present study includes: (1) the examinationof the psychometric evidence of the DET instrument (e.g., item analysis) including the reliabilityevidence, (2) exploratory factor analysis (EFA) to refine the factor structure given the newcharacteristics of the participant sample compared to those from the previous research by Yasar,et.al., and (3) comparison of the mean score differences across the following four backgroundvariables: Gender, Years of Teaching, and Ethnicity (Caucasian and non-Caucasian). Thestatistical analysis was completed in SAS using the Proc Mixed command. ResultsResults indicated that the DET instrument showed evidence of acceptable reliability for totalscore and for each factor/subscale score, ranging from 0.77 to 0.91. However, the EFA proposeda slightly different factor structure than in the previous study. Significant mean difference in totalscore was found between male and female respondents. In addition, the Gender variablesignificantly impacted the mean score of the “Importance of DET” factor and three items underthis factor. There was also a significant mean difference based on teaching experience and“Familiarity with DET” factor. The Ethnicity variable played an important role in differentiatingpeople on five individual items, although no significant mean difference was found on factorscores across the two race groups. ConclusionsOur study highlights the importance of a continuous evaluation of instruments in engineeringeducation especially considering the changing populations of teachers and the increasingemphasis on engineering education in K-12 classrooms. ReferencesYaşar, Ş., Baker, D., Robinson-Kurpius, S., Krause, S., and Roberts, C. (2006). Development of a Survey to Assess K-12 Teachers’ Perceptions of Engineers and Familiarity with Teaching Design, Engineering, and Technology, Journal of Engineering Education, 95(3), 205-216.
Hong, T., & Purzer, S., & Cardella, M. E. (2011, June), Using Factor Analysis to Re-visit the Teaching Design, Engineering, and Technology (DET) Survey Paper presented at 2011 ASEE Annual Conference & Exposition, Vancouver, BC. https://peer.asee.org/18793
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