What is the approach, and how does it contribute to the findings of the study?

Read the below article and identify the role of secondary data analysis in this article. What is the approach, and how does it contribute to the findings of the study?Bottomley, P.A., & Holden, S. J. (2001). Do we really know how consumers evaluate brand extensions? Empirical generalizations based on secondary analysis of eight studies. Journal of Marketing Research, 38(4), 494-500. ~ (This is a good example of APA format) ~ hint, hint!
PDF of article is attached. Thank you!