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Abstract

This study aims to: 1) develop the test testlet assessment instrument mastery of concepts on temperature and heat for class X SMA with valid category, 2) determine the characteristics of the test testlet assessment instrument items mastery of concepts on temperature and the heat of the class X. This research use research and development ADDIE models. Data obtained from experts validator and students of SMAN 3 Blitar. Validation result from three expert validators are items that developed included in the category average is quite valid and invalid. Reliability mastery of concepts items have a very high category with a value of 8.37. The difficullty index of item, consisted of 23 questions easy categories, 7 questions medium category and 2 questions difficult category. Discrimintation index of items consisted of 11 questions bad category, 7 questions enough category, 12 questions good category and 2 questions excellent category.

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