THE DEVELOPMENT OF STUDENT ACTIVITY SHEET ORIENTED GUIDED DISCOVERY LEARNING MODEL TO PRACTICE SCIENCE PROCESS SKILLS ON REDOX REACTION SUBJECT FOR TENTH- GRADE SENIOR HIGH SCHOOL STUDENT

Abstract

This study is aimed to 1) Determine the internal validity of students’ activity sheet developed regarding to the criteria in terms of content, presentation, linguistic and graph 2) Determine the external validity of students’ activity sheet developed in terms of student responses supported by the observation data. The research object is the learning material that developed in the form of students’ activity sheet that will be used as a learning tool in X grade of SMA/MA. The design of students’ activity sheetdevelopment refers to the method of development of the four-D method proposed by Thiagarajan, Semmel, and Semmel. Science process skill drilled in this research is to design a scientific research, conduct scientific research, collect the data, analyze the data, and draw a conclusion. Sources of the data in this study were obtained from the data review and validation of chemistry lecturer and high school chemistry teacher. The limited trial was conducted on 30 students of XI grade of Senior High School that got the redox material included in the evaluation field. The data were analyzed descriptively. The results of the study based on the validation data from each of the criteria get a percentage between 90.35% to 93.33%, students’ activity sheetdeveloped is categorized as valid. Based on the data from student questionnaire students responses for each criterion get a percentage around 88.24% to 97.00%. Therefore, the students’ activity sheetdeveloped is categorized as valid.

Keywords: students’ activity sheet, guided discovery, science process skill, redox.