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...Th icriems proceedings published by faculty of mathematics and natural sciences yogyakarta state university isbn a two tier diagnostic test instrument on calculus material what why how b asma khiyarunnisa heri retnawati education postgraduate program univesity jln colombo no karangmalang sleman corresponding author student uny ac id abstract students difficulties in learning have become one the interesting things to reveal can be found from some errors made process problem solving this issue becomes important note because its effects is outcomes will not maximal if math problems corrected then make same at tool for analyzing article aims describing develop it so that used as diagnose based onerrors when completing items instruments description conducted review literatures related tests well relating them error meaning are also discussed including strength weakness introduction branch science s studied almost every secondary only indonesia but all corners world foundation development te...