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.
