This study aims to develop students’ worksheet based on PBL to train analytical thinking skills on electrolyte and non-electrolyte material which is suitable to use. The feasibility of students’ worksheet in terms of validity aspects (content and construct), practicality, and effectiveness. This research developed students’ worksheet in 4D model which consists of defining stages, designing, developing and distributing, but its implementation is limited to the development stage. The development of students’ worksheet in the study is referred to the phases of problem based learning and analytical thinking skills elements. The validity aspect is based on the assessment of expert lecturers. Practicality is based on student responses. Effectiveness is obtained from the test value of students’ analytical skills. The trial was conducted on 12 students in SMAN 3 Sidoarjo. The results of the research in the validity aspect of students’ worksheet obtained a very valid criteria with an average percentage of 84.17% in the terms of content and 90.28%, 90.28%, 88.89% in the terms of constructs, respectively for language, presentation and graphics. The students’ worksheet obtained a very practical criteria which was assessed from the results of the students' responses with an average percentage of 90.56% and supported by student activities. The results of the analytical thinking skills test of students’ showed an average N-Gain score of 0.84 in the high criteria and obtained classical completeness of 91.67%, so that the students' worksheets was said to be very effective. Overall, the development of student worksheets is PBL said to be feasible to be used in training analytical thinking skills on electrolyte and non-electrolyte material.

Keywords: PBL, stundents’ worksheet, analytical thinking skills, electrolyte and non-electrolyte.