A comparative analysis of the consistency and difference among teacher-assessment, student self-assessment and peer-assessment in a Web-based portfolio assessment environment for high school students

This study explored the consistency and difference of teacher-, student selfand peer-assessment in the context of Web-based portfolio assessment. Participants were 72 senior high school students enrolled in a computer application course. Through the assessment system, the students performed portfolio creation, inspection, selfand peer-assessment; three teachers reviewed portfolios and evaluated learning performances. There were significant differences in the results of the three assessment methods, among which teacher-raters adopted the most rigorous scoring standards, while peer-raters tended to use the most lax standards. The results of selfand teacher-assessment were discovered to be consistent; however, consistency was not discovered between selfand peer-assessment as well as peerand teacher-assessment. In analyzing their consistency with the end-of-course examination, teacherand self-assessment demonstrated high consistency, whereas peer-assessment showed a low level of consistency. Crown Copyright 2011 Published by Elsevier Ltd. All rights reserved.