<![CDATA[This research purpose is to assess and improve the thinking abilities of 11 grader of SMAN 1 Pekanbaru by using classroom-based action research. Problem-Based Learning Model has been used in thermochemistry section of Chemistry subject to improve learning ability. The thinking and learning ability data are directly collected from students’ worksheets (SWs) and observation of students’ spontaneous questions, the quality of that questions and also the quality of the answers when the teaching activities were held. The subject comprehension data are carefully taken from essay written test and SWs assessment. The results showed the improvement of students’ spontaneous questions and answers in C3 (+37,5%), C4 (+3,3%), C5 (+4,7%), C6 (+11,1%), but in C1 (-34%) and C2 (-11,1%) were found. In SWs, the improvements are showed in C3 (+21,7%), C4 (+2,9%), C5 (+7,1%), C6 (+12,8%), and degression in C1 (-44,3%) and C2 (-18,6%). In subject comprehension, for essay written test, improvements are showed in excellent (+11,4%) and very good (+14,3%) cetegories, whereas degression is showed in good (-2,9%), fine (-9,6%) and bad (-11,4%) categories. In subject comprehension, for SWs assessment, improvements are showed in excellent (+8,6%) and very good (+5,7%) categories, whereas degression in good (-11,4%), fine (-2,8%) categories. Fortunately there is no student in bad categories. The results showed that problem-based learning model can improve learning and thinking abilities of the students.]]>
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