Development of a three tier test to assess high school students understanding of asids and bases

Two-tier tests are such as assessment tools that can make available for teachers/researchers to determine students alternative conceptions and whether a student gives a correct response to a question by understanding the related subject since the secondtier of a test asks for a reason for the first-tier response. The purpose of this study was to develop a valid and reliable three-tier diagnostic test to assess students’ understanding of acids-bases concepts. For developing this test, interviews and open-ended questions were administered to high school students and related literature was reviewed; the findings obtained from these steps construct the three-tier test