<![CDATA[This study generally aims to describe the validity of Problem-based learning worksheets in class IV IPAS learning at SDN 17 Pontianak City. This research is a type of development research (Research & Development) with reference to the ADDIE development model. The research method used is a mixed method between quantitative research and qualitative research. The data source of this research is the validation results from 2 material experts, 2 language experts, and 2 design experts. The data collection techniques used were interviews and questionnaires. The validity of student worksheets is carried out up to 3 stages, namely Analyze, Design, and Development. The results showed that the validity of the learner worksheet based on the results of validation from material experts on the material aspect obtained a percentage of 89.7% including in the "Very Valid" category, and based on the results of validation from linguists on language aspects obtained a percentage of 88.3% including in the "Very Valid" category, and based on the results of validation from media experts on media aspects obtained a percentage of 80% in the "Very Valid" category.]]>
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