Abstract
The aim of this research is to determine the feasibility of student worksheet oriented on project based learning (PjBL) to train students' creative thinking skills on acid-base material. The research method referred to the 4D development design that consisting of 4 stages including: (1) define, (2) design, (3) development, and (4) dissemination. This research was limited to development stage. The limited trial was treated to 12 students of eleventh grade of a State Senior High School. Feasibility of worksheet was reviewed from the content validity and the construct validity (aspect of language, presentation, and graph) through validation results of experts, practicality through student activity observation and student response, and effectiveness through creative thinking skills test. Creative thinking skills included four aspects: fluency, flexibility, elaboration, and originality. The data analysis used qualitative and quantitative descriptive analysis methods. The results showed that the developed worksheet was valid in terms of content validity (84.44%) and construct validity (83.63%). Practicality in terms of relevant student activities observation and student responses got percentage of 92.74% and 93.66% in very practical category. The effectiveness of creative thinking skills training in terms of the N-gain score had a percentage of 0.60 in enough category.
 Key words: worksheet, project based learning, creative thinking skills
Highlights
Based on the Minister of Education and Culture Regulation number 22 the year 2016 about the standard of basic and secondary education has been explained that one of the learning principles is learning that emphasizes the single answer towards learning to learn with multidimensional correct answer [1]
The questionnaire was used as a data collection method to determine feasibility of developed worksheet
The number of students that used in the limited trial was to 12 students of XI MIPA a State Senior High School, which were selected heterogeneous based on their academic abilities
Summary
Based on the Minister of Education and Culture Regulation number 22 the year 2016 about the standard of basic and secondary education has been explained that one of the learning principles is learning that emphasizes the single answer towards learning to learn with multidimensional correct answer [1]. Based on this principle of learning, a very important competency for training is creative thinking skills. There are four components of creative thinking skills, including fluency, flexibility, originality and elaboration [3]. Fluency is the ability to generate a lot of ideas quickly, flexibility is the ability to generate ideas and answers that are reviewed from various points of view, originality is the ability to trigger original ideas, and elaboration is the ability to complete or detail of an idea
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