Characteristics of CPS-Based Assessment Instrument for Critical Thinking Ability in Stoichiometry

The purpose of this study was to determine the characteristics (validity, reliability, difficulty indices and discrimination indices) of the items in the developed assessment instruments. Subjects in the study were 30 students of class X Science 1 SMA Negeri 2 Bantan. The samples in this study were chosen by purposive sampling technique, in which the samples were selected based on the researchers' consideration. Then, the approach used to develop the assessment instrument was Research and Development (R&D) adapting Borg & Gall Model. In this study, the feasibility test was carried out to see the construct validity, reliability, difficulty indices, and discrimination indices of the instrument. The CPS-based assessment instrument for critical thinking ability on Stoichiometry was developed in the form of essay questions. This instrument produced 10 items that were declared valid and reliable with a reliability value of 0.749. Thus, this study concluded that CPS-based assessment instrument for critical thinking ability provided more comprehensive information about the characteristics of the instruments that have been developed.