This study aimed to describe the quality of student’s abilities in problem solving, improving critical thinking to get learning outcome much better. In the model of learning that use problem based learning operating the learning of process of student’s grade X (science department-one) 4 singaraja of senior high school about 35 people. This research is a classroom action research (CAR), with using a descriptif of qualitative research method, which refers to the the model of Kemmis and Mc Taggart who performed a total of two cycles. Each cycle consist of four stages, namely: 1) Action Plan, 2) Taking Action and Observation Action, 3) Reflection. The result of this study indicate that the application of problem-based learning model can improve learning outcomes of craft dan enterpreneurship subject’s on the concept of communication device. The mean result of study of student’s in the first cycle and second cycle are respectively 70,94 and 82,77 which include the high category. The number of learners who have reached values above criteria minimal of completeness also increased to 88,57 % on the second cycle rather than in the first cycle as much as 40 %. This shows that the results of subject craft and enterpreneurship in the concept of communication device lesson has increased significantly compared to the cycle I. Besides the problem based learning model proved effective enough to be applied in the commucication device concept.
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