Тhe aim of this study is to develop an instrument of evaluation constructed using the CIPP model in the implementation of portfolio in science learning. Тхис study used research and development (R&D) method, adapting 4-D development model integrated with the development of non-test instruments. The subjects of this study were science teachers and 8th grade students of Junior High School in Yogyakarta. The validity test was analyzed by using V'aikens formula. Reliability is analyzed by using Interclass Correlation Coefficient (ICC) technique.Тhe results of this study shows the instrument is valid. The Aiken’s V coefficient ranged from 0.900 to 1.00. The Cronbach’s Alpha coefficient is above 0.800 so the instrument is considered reliable. The practicality was obtained in a very practical category.Тhe instrument of evaluation used to evaluate the implementation of portfolio assessment and the results shows that the implementation of portfolio assessment in Junior High Schools in Yogyakarta is in a good category.

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