(2000), whereas in the summative assessment group, the common traditional summative assessment approach was implemented. After the treatment phase, both experimental groups were given another writing section of the PET test and the same anxiety and autonomy questionnaires as the posttests. The analysis of the test scores using two independent-samples t-tests and an analysis of covariance (ANCOVA) revealed that the summative assessment group had a significantly higher post-treatment level of anxiety. Furthermoe, the level of post-treatment autonomy in the portfolio assessment group was significantly higher. It was also concluded that there was a non-significant difference between the impact of portfolio and summative assessment on writing scores when controlling for the impact of pretest scores.
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