Discuss cohort-sequential designs and give an example.

What will be an ideal response?

Ans: Answers vary
Answer should include some of the following points:
In a cohort-sequential design, age is treated as both a between-subjects and within-subjects factor. Cohort-sequential designs begin with separate samples of different age groups, as in a cross-sectional design. Then these age groups are tested multiple times as they develop to allow participants to be tested at multiple ages, as in a longitudinal design. Chouinard and Roy (2008) conducted a cohort-sequential study to investigate the decline in motivation in math studies in high school students. A sample of 704 students in 7th grade and 625 students in 9th grade completed a scale that measured competency in math skills. All students were attending high schools in the Montreal, Ontario, Canada, area at the time of the study. Repeated administration of the competency scale occurred twice a year for 3 years. Thus, when the study was completed, the students who were first tested in 7th grade had completed 9th grade, and the students who were first tested in 9th grade had completed 11th grade.