Abstract :
This research explored the influence of a Web-based portfolio assessment
system on students’ performances. The methodological procedure adoptedwas
to have the experimental group use the system, with the control group using
conventional assessment. The study subjects were junior high school students
of two computer classes. The experimental results revealed that the use of the
system has significant positive influence on students’ performances. According
to estimated effect size, the most significant indicators were reflection, selfassessment,
continuous improvement, goal setting, problem solving, data
gathering, work and peer interaction. However, peer-assessment performance
was not enhanced significantly. Therefore, one recommendation was to reduce
peer-assessment and instead offer specific illustrations to the students aswell as
the opportunity to drill.
