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The aim of this study is to develop a valid and reliable two-tier diagnostic test in order to define 7th grade students’ conceptual understanding of fixed subjects which are in the unit of "Structure and Properties of Matter" in Science course curriculum. In this context, firstly current learning objectives were analyzed, essential changes were made and learning objec-tives were classified according to Bloom’s revised taxonomy. Then, literature was reviewed and item pool with 47 multiple choice items was developed.The test was evaluated by four chemistry teachers and three Science teachers for the content validity. The test was reduced to 33 items and applied to 225 7th grade students from different schools. Reliability coefficient of the test was found to be 0.91.

The Development of Two-Tier Concept Test for The Structure and Properties of Matter Unit