The Effect of Treffinger Learning Model on Critical Thinking Ability of Students in SMK 3 Yogyakarta

This research aims to determine the effect of treffinger learning model toward the critical thinking ability of students in SMK 3 Yogyakarta. This research is a quasi-experimental research design with post-test only non-equivalent group design. The sampling is in the form of purposive sampling technique obtained sample of 64 learners in SMK 3 Yogyakarta which divided into experiment and control groups. The experimental group apply treffinger learning model in TITL-1 while control with discovery learning model in TITL-2. This study was conducted for 8 meetings. The analysis of test data used t-test with SPSS 16 program. The result hypothesis analysis of t-test obtained t count > t table is 2,443 > 1,999 and P value is 0.017 < 0.05 then Ho is rejected. The research indicates that between a group of experiments using model learning treffinger with controls that use the discovery learning has the effect of significantly different critical thinking ability of students. It concludes that there is a difference in average critical thinking ability on both models of learning. Keywords—critical thinking ability, Treffinger