Dr. Tucker wanted to learn how aggression changes across development. He designed a study in which he assessed aggression among 100 children who were 3 years old and then reassessed aggression among these individuals every three years until the participants were 21 years old. Dr. Tucker's research design was cross-sectional.

Question

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Dr. Tucker's research design is actually longitudinal, as he is following the same group of individuals over time and assessing them at multiple points in their development. A cross-sectional design would involve assessing individuals at one time point, but with varying ages or stages of development.

Dr Tucker Wanted to Learn How Aggression Changes Across Development