[Title: The Effect of Thinking Aloud Pair Problem Solving Learning Model Toward Student Physics Science Learning Outcomes]. This research aims to know the effectiveness of the learning problem based learning model assisted work sheet for the critical thinking ability of physics students of grade X SMAN 1 Lingsar inacademics year 2016/2017. This was an experiments research that using design research Posttest-Only Control group Design. The population in this research were the whole grade X SMA

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... eri 1 Lingsar in academics year 2016/2017. Sampling taken with using cluster random sampling technique with the students of class X. MIA. A as experiments class and grade X. MIA. D as controls class. Research hypothesis was analysis with the t-test for one party (the party right). Based on the hypothesis test results obtained tcount> ttable at significance level of 5%, then it can be inferred that the model of learning problem based learning assisted work sheet effective for critical thinking ability of physics students SMAN 1 Lingsar.