This study developed a four-tier test diagnostic test instrument to identify students' misconceptions on the material of the kinetic theory of gases and the laws of thermodynamics. This research is a development research using the 4D model. The 4D development model consists of four stages, namely: 1) Define, 2) Design (Design), 3) Develop (Development), 4) Disseminate (Spread). The instrument used in this study The instrument used in this study was a test instrument quality assessment sheet for material experts and evaluation experts. Assessment of product quality uses a Likert scale with 5 scales made in the form of a checklist. The results of the research developed were a four-tier test diagnostic test instrument to identify student misconceptions on the material of gas kinetic theory and the laws of thermodynamics. This four-tier test diagnostic test instrument consists of 16 items. Item validation includes the content validity in terms of material, construction, and language / culture aspects, as well as the suitability between the questions on the test and the indicators obtained from the consideration of expert lecturers. The practicality test of the Physics Diagnostic Test questions was given to 2 physics educators and 12 students of class XI IPA1 MAN 1 West Pasaman assessed from the aspects of ease and legibility of the questions in the implementation of the test. The effectiveness test was tested on 20 students of class XI IPA 1 MAN 1 West Pasaman by providing an Instrument for a Physics Diagnostic Test. The results of this study have produced Physics Diagnostic Test questions that are valid, practical and effective. The Physics Diagnostic Test item is valid both in terms of material, construction and language with an average value of 89.7% with a very valid category. The practicality of the Physics Diagnostic Test items has an average value of 81.8% with the practical category, while for the effectiveness of the product, the validity of the questions is 80%, the reliability of the questions is 0.78, the level of difficulty and the distinguishing power of the questions are good on each point of the problem. generated with an average value of 24%.
Diagnostic test, four-tier test, kinetic theory of gases, thermodynamics, misconceptions