Abstract

The COVID-19 pandemic has had a major impact on all aspects of human life, especially in the education aspect. Then, an online learning policy, as well as an online assessment, has been implemented as an effort to prevent the spread of the virus. Aspects of knowledge are assessed based on students' understanding of a concept obtained through teaching and learning activities. This study aims to develop a three-tier diagnostic test instrument that has been tested for feasibility, validity, and reliability. The method used in this research was Research and Development using a 4D model consisting of define, design, development, and disseminate stages. The research subjects were students of class VIII and IX of MTs Hidayatus Shibyan. The data collection was carried out using the observation method, validation sheets, test questions, and student response questionnaires. The validation sheet and classical theory analysis were used to determine the level of validity and reliability of a product. The results of material expert validation data obtained an average score of 24.8 out of 28 s and media experts obtained an average score of 20 out of 24 categorized in the very feasible criteria. The reliability analysis at the trial stage obtained 0.635 and the implementation test stage was 0.795 which indicates as reliable. The percentage of students' misconception profile on the material of the human digestive system at the trial stage was 33.6% then at the implementation test stage, the percentage was 41.7% categorized in moderate criteria. Students mostly responded very agree in the questionnaire with the percentage of 45.4% at the trial stage, and 54.2% at the implementation test stage.