This chapter focuses on the analysis of three or more variables to answer more complex research questions. It discusses when to use various kinds of multivariate analyses and how to elaborate the findings with additional variables. The chapter presents linear multiple regression analyses and elaboration techniques with control variables. It explores whether the relationship is still statistically significant when controlling for sex of the respondent; that is, does it still apply equally to men and women. Sex becomes the test or control variable used to elaborate the original relationship between education and income. Using control variables is one kind of multivariate analysis, primarily focused on providing more elaborate understanding of initial relationships. Another important type is an analysis of additional independent variables that might contribute to a better and more complete understanding of the dependent variable or outcome.