International Journal of Academic Pedagogical Research (IJAPR)   Year: 2021 | Volume: 5 | Issue: 2 | Page No.: 57-60 Development Of Social Studies Learning Instrument Based On Two Dimensional Bloom Taxonomy On Primary School Ida Maulidatuzakiyah, Chumi Zahroul Fitriyah, Dyah Ayu Puspitaningrum Abstract: Assessment of learning outcomes requires an assessment instrument to measure the level of student understanding of the learning process. This research was conducted to develop an instrument for assessing social studies learning outcomes based on two-dimensional Bloom Taxonomy in elementary schools. The formulation of the problem in this study is how the process and results of the development of social studies learning outcomes assessment instruments theme 3 and 4 which are suitable for cognitive levels C4, C5, and C6 based on two-dimensional Bloom Taxonomy. The purpose of this development research is to describe and develop an instrument for assessing social studies learning outcomes themes 3 and 4 that are suitable for cognitive levels C4, C5, and C6 based on the two-dimensional Bloom Taxonomy. The results of the analysis of the validity test of all items have met the value of rcount> rtabel. The reliability test using the Alpha-Coarnbach method obtained the results of the A part of the reliability value a = 0.791, the B part of the reliability value a = 0.602, and the C part of the question the reliability value of a = 0.621. Analysis of the difficulty level of the questions is known to be 25% difficult, 15% moderate, and 60% easy. The analysis of the difference in power obtained the results of 3 good category questions, 5 fair category questions, 11 weak category questions, and 1 very weak category questions. Based on this, it can be concluded that the developed social studies questions are valid and suitable for use as an instrument for assessing social studies learning outcomes.