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The content validity of the Students' Worksheets had been proven
based on the expert evaluations displayed in Table 9, where all Aiken scores
are greater than 0.81, similar to the summary of the lesson plan review
results. As a result, it can be utilized to help students understand how to
write argumentative essays.
The classroom action research cycle systematically monitors and
analyzes the model stability process. Hence, implementing an observation
protocol is necessary to systematically observe students' and lecturers'
behaviors and actions during the learning process to establish a
comprehensive model. It was used also as an instrument to measure the
quality of the model’s implementation. The observation protocol was
developed based on the specific attributes of the multipurpose assessment
model. The results of expert validation are shown in Table 10 below.
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