Development WE-PST instrument to measure students problem-solving skills in work and energy
Indah Safitri (a*), Parlindungan Sinaga (a), and Endi Suhendi (a)

a) Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229 Bandung 40154, Indonesia

Abstract

Problem-solving skills is one of the most important skills in physics. The aims of the study are to develop WE-PST (work and energy problem-solving test) to measure students^ problem-solving skills of work and energy concepts based on Rosengrant stages. The research method in this study was modified by Oriondo and Dallo-Antonio model (planned test, tried out the test, determinine validity, and determine reliability). The developed instrument test was an essay test consisting of 25 items. The subjects of this study were 35 students in the twelve grade (16-18 age in average) at high school in Bandung. WE-PST developed to measure student^s problem-solving skills in physics with five stages based on Rosengrant stages, that described the problem, make a representation the problem, choose solution the problem, solve the problem, and evaluation. The data were analyzed with MINISTEP software 8.4.0. The item validity of the WE-PST test instrument with the measurement value of raw variance is 53.4% and the Cronbach Alpha reliability was 0.95. And the construct validity of the WE-PST test instrument was 0.87. The conclusion is WE-PST instrument as a valid and reliable instrument. From this result we can consider that this instrument can be used to measure students^ problem-solving skills of work and energy concept.

Keywords: problem-solving skills- instrument- Rasch model

Topic: Physics Education