In a(n) ______ research design, the performance of one group of individuals is assessed repeatedly across a portion of the lifespan.

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A longitudinal research design involves following the same group of individuals over a period of time and assessing their performance repeatedly. This design is useful in studying changes and continuities in behavior and development over time. Cross-sectional designs compare groups of individuals at a single point in time, experimental designs manipulate variables to test cause-and-effect relationships, and sequential designs combine elements of both longitudinal and cross-sectional designs.

In A(n) ______ Research Design, the Performance of One Group