In a study of the development of social skills, a group of children were tested every other year for 6 years. This was a _______ study.

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A longitudinal study involves studying the same group of individuals over a period of time, in this case, testing the children every other year for 6 years. Cross-sectional studies involve comparing different groups of individuals at the same point in time, while a horizontal study is not a recognized research design. A case study involves in-depth analysis of a single individual or group.

In a Study of the Development of Social Skills, a Group