THE INSTRUMENT FOR ASSESSING THE PERFORMANCE OF SCIENCE PROCESS SKILLS BASED ON NATURE OF SCIENCE (NOS)

This study seeks to (1) reveal the feasibility of an instrument used for assessing the performance of science process skills; (2) describe the assessment results of student’s science process skills; (3) find out the practicality of the instrumentto measure student’sscience process skills. This research and development adopted 4D model and non-test instruments. The results of the study are: (1) the instrument for performance assessment which is in the form of observation sheet, is valid and reliable to measure science process skills; (2) the assessment reveals that students have average prediction and inferential skills, good experiment, measurement and communication skills, and very good observationskills; (3) the instrument has high practicality for measuring student’s science process skills.