Reliability and validity of Web-based portfolio peer assessment: A case study for a senior high school’s students taking computer course

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Title:	Reliability and validity of Web-based portfolio peer assessment: A case study for a senior high school’s students taking computer course
Authors:	Chang, Chi-Cheng Tseng, Kuo-Hung Chou, Pao-Nan Chen, Yi-Hui
Keywords:	Learning portfolios Web-based learning portfolios Web-based portfolio assessment Peer assessment
Date:	2012-09
Issue Date:	2012-10-03T03:05:18Z (UTC)
Abstract:	This study examined the reliability and validity ofWeb-based portfolio peer assessment. Participants were 72 second-grade students from a senior high school taking a computer course. The results indicated that: 1) therewas a lack of consistency across various student raters on a portfolio, or inter-rater reliability; 2) twothirds of the raters demonstrated inconsistency assessing different portfolios, i.e. inner-rater reliability; 3) peer-assessment scores were not consistent with teacher-assessment scores (criterion-related validity); 4) significant differences were found between peer-assessment scores and end-of-course examination scores, implying that Web-based portfolio peer assessment failed to reflect learning achievements (criterion-related validity). In short, Web-based portfolio peer assessment was not a reliable and valid method.
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