THE DEVELOPMENT OF A SET OF INSTRUMENT FOR STUDENT PERFORMANCE ASSESSMENT IN THE PHYSICS LABORATORY WORK SUBJECT OF JUNIOR HIGH SCHOOL

This study aims to develop a set of instrument for the measurement of the laboratory work ability performance on physical subjects of junior high school students to measure the writing the report lab work‘ ability performance on physics subjects. This research was conducted through three stages, namely: the initial instrument development, the try out, and interpretation of the measurement result. The initial development stage included instrument writing, reviewing and validating of the blue print of the instrument, items, and assessment guidelines. The content validation was carried out by the measurement experts, physical education specialists, and teachers physics through forum group discussion (FGD).The instrument that had been validated was tried out to 54 students by involving three raters. Interpretation of the measurement results be described using the total score as the basis for the categorization of assessment. The results of the development a set of instrument for the measurement of the preparation of laboratory reports ability performance on physical subjects of junior high school students, aspects that measured include: statement of the problem, experimental design, data collection and display, data analysis, and conclusion. The reliability index of the instrument try out is at the exellent category of 0.858. The results of measurement showed that the preparation lab report ability performance on physics subjects scores are dominantly in the second and third categories out of the four categories. Thus, the writting of lab work reports ability performance of physical subjects of junior high school students are not satisfactory