Abstract :
The purpose of this study was to determine the Effect of Application of
Creative Problem Solving Learning Model (CPS) with Lesson Study Patterns on
Creative Thinking Ability of Class X Students of SMA Negeri 1 Masbagik
Academic Year 2019/2020. This type of research is experimental research using
Quasi Experimental Design. The population in this study students of class X IPA
semester I consisting of 5 classes with a total of 179 students. The sample in this
study is class X IPA 2 as the experimental class and class XI IPA 1 as the control
class using simple random sampling technique. The instruments in this study were
tests of cognitive learning outcomes in the form of essay tests totaling 8 items.
Based on the results of data analysis obtained the average value of the
experimental class posttest is 74,57 and the control class is 61,27. While the
hypothesis test using statistical analysis with the t-test formula at the 5%
confidence level is obtained by tcount of 4,11. after compared with t table 2,00,
then tcount 4,11> t table 2,00, so the conclusion of this research is that there is an
influence of the Creative Problem Solving Learning Model (CPS) with Lesson
Study Patterns on the Creative Thinking Ability of Class X Students of SMA
Negeri 1 Masbagik Academic Year 2019/2020
Keywords: Creative Problem Solving, Creative Thinking Ability, Lesson Study