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Lengthy standardized assessments decrease instructional time while increasing concerns about student cognitive fatigue. This study presents a methodological approach for item reduction within a complex assessment setting using the Problem Solving Measure for Grade 6 (PSM6). Five item-reduction methods were utilized to reduce the number of items on the PSM6, and each shortened instrument was evaluated through validity evidence for test content, internal structure, and relationships to other variables. The two quantitative methods (Rasch model and point-biserial) resulted in the best psychometrically performing shortened assessments but were not representative of all content subdomains, while the three qualitative (content preservation) methods resulted in poor psychometrically performing assessments that retained all subdomains. Specifically, the ten-item Rasch and ten-item point-biserial shortened tests demonstrated the overall strongest validity evidence, but future research is needed to explore the psychometric performance of these versions in a new independent sample and the necessity for subdomain representation. Implications for the study provide a methodological framework for researchers to use and reduce the length of existing instruments while identifying how the various reduction strategies may sacrifice different information from the original instrument. Practitioners are encouraged to carefully examine to what extent their reduced instrument aligns with their pre-determined criteria.