Cetin-Dindar, AylaGeban, Omer2020-03-262020-03-2620111877-0428https://dx.doi.org/10.1016/j.sbspro.2011.03.147https://hdl.handle.net/20.500.12395/263253rd World Conference on Educational Sciences (WCES) -- FEB 03-07, 2011 -- Bahcesehir Univ, Istanbul, TURKEYTwo-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 second-tier 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. (c) 2011 Published by Elsevier Ltd. Open access under CC BY-NC-ND license.en10.1016/j.sbspro.2011.03.147info:eu-repo/semantics/openAccessChemistry assessmentthree-tier testsacids and basesConference Object15600604N/AWOS:000466750600106N/A