<![CDATA[The purpose of this research is to develop the appropriate treatment instrument and measurement instrument of concept mastery. This research use approach of research and development of ADDIE model. Data obtained from expert validator and student of SMAN 1 Blitar. The validation results of both expert validator obtained 17 items valid and test results obtained 15 items valid question. The reliability of the con-cept mastery measurement instrument has a very high category with coefficient value α = 0.682. The difficulty level of the item consists of 2 item in easy category questions, 8 item in medium category, and 7 item in difficult category questions. Different problem of item consists of 1 item of bad category, 4 item of good category, and 12 item of excellent category.]]>
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