Development of Assessment Instruments in Project-Based Learning to Measure Students Scientific and Numeracy Literacy Ability on Harmonic Vibration Materials

Abstract

This study aims to develop an assessment instrument in project-based learning to measure Students scientific literacy and numeracy skills on valid, reliable and practical harmonic vibration material. The development design uses the Research and Development method with 7 development steps adapting from Borg & Gall (1989) which includes the research and data collection stages, planning, initial product development, initial field trials, revision of test results, field trials, and product revisions. operational. Product validation was carried out by two expert lecturers and one teacher to assess aspects of construction, substance and language, the results of expert validation of the assessment instrument were 90.65% with a very valid category. The results of field trials on 36 students were analyzed using the Rasch model with the help of Ministep 4.5.1 software. The results of the analysis of the test data obtained that 19 items of the instrument of scientific literacy ability and 12 items of the instrument of numeracy literacy ability were declared valid. The items on the scientific and numeracy literacy assessment instruments were also declared reliable with Cronbach's alpha values of 0.90 and 0.80, respectively, with excellent and good reliability categories. The practicality test of the instrument obtained an average practicality assessment score of 85.83 and was included in the very high criteria. The final product of the assessment instrument developed has met the instrument's eligibility standards, namely valid, reliable and practical.