developing learning tools guided discovery models assisted phet simulations for training critical thinking skills high school students

this research is aimed to develop learning device of guided discovery model with phet simulation to trill students critical thinking skill. this research uses 4d development model and tested on 15 students of class xii ipa with test design using one group pretest-posttest design. learning tools developed include: (a) syllabus (b) rpp, (c) student books, (d) lks, and (e) tests students critical thinking skills. research data obtained through validation method, observation, test, and questionnaire. the results are analyzed descriptively quantitative and qualitative. the students critical thinking ability is analyzed by n-gain. the result of the research shows that (a) learning device developed categorized is very valid, (b) learning activity is done very well, (c) critical thinking ability of students have moderate improvement, and (d) students respond very positively to learning which has been implemented. based on the results of the analysis and discussion, it was concluded that the learning device of guided discovery with phet simulation model developed is feasible to be used for trained critical thinking skills of high school students.