<![CDATA[This research is served to describe: (1) the students’ learning activitiesin problem solving techique; (2) students’ courage to pose ideas; (3) students’ ability to share ideas in problem solving technique; (4) students’ ability in having the critical thinking in solving the learning problems. This research covers two cycles, each of which includes planning, implementing, controling, and reflecting. The subject of the research are 32 fifth graders of SD Negeri Kasepuhan Sewon Bantul being taught by problem solving technique to develop their critical thinking and problem solving skill of the Social Science subject. The results show that: (1) the students’ activity develops from 5 active students in pre research stage to 10 in the first cycle; and it becomes 28 in the second cycle; (2) students’ courage to pose ideas develops from 4 courageous students in pre research stage to 15 in the first cycle; and 25 in the second cycle; (3) the ability to share ideas develops from 7 capable students in pre research to 12 in the first cycle, and 26 in the second cycle; (4) the thinking skill develops from 2 skilled students in problem solving in pre research stage to 17 in the first cycle, and 24 in the second cycle. The results of the research recommends that poblem solving technique is efficient in developing students’ activities, critical thinking skill and problem solving skill in the Social Science subject for the fifth graders of SD Negeri Kasepuhan Sewon Bantul. Key words: Students’ Learning Activities, Critical Thinking Skill, Problem Solving]]>
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