Abstract
This study aims to develop an assessment instrument that is able to measure collaboration and problem solving abilities in project-based physics learning that is valid, reliable and practical. This type of research is Research Development by adapting 7 stages of development from Borg Gall. Product expert validation was carried out to assess aspects of construction, substance and language, the results of expert validation of the assessment instrument were 87.85% with very valid criteria. As for the analysis of the results of field trials on 64 students using the Rasch model, it was obtained: (1) 21 questions about the collaboration ability instrument and 19 questions about the problem solving ability instrument were declared valid; (2) the reliability value of the collaborative and problem-solving ability assessment instrument is 0.97 and 0.89 (very good category); (3) the average value of the practicality test of the collaboration and solving ability assessment instrument is 81.21 (very high criteria).
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