ABSTRACT
Intervention research constitutes a broad research category, encompassing a large number of experimental, psychological, and medical research designs. While this type of research can build on rather simple designs and few variables, multivariate longitudinal designs allow for tests of more complex treatment assignments and models, as well as mediation. The focus of this chapter is on models and methods for evaluating longitudinal intervention effects in the presence of mediation: that is, the methods for analyzing the longitudinal impact of an intervention or treatment when that impact is mediated by one or more other variables.
