Schaie's influential study on intellectual change over time utilizes the ____ research design he invented.

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Schaie's influential study on intellectual change over time utilizes the sequential research design, a method he invented that combines both cross-sectional and longitudinal designs to analyze changes in intelligence across different cohorts over time. This approach allows for a more comprehensive understanding of how intelligence changes across the lifespan by addressing the limitations of both the cross-sectional and longitudinal designs when used independently.

Schaie's Influential Study on Intellectual Change Over Time Utilizes the ____