ABSTRACT
In many psychological experiments we are not only interested in the effects of a single independent variable on the dependent variable. Rather, we can be interested in the effects of two or more independent variables. The main reason for this is because we may hypothesise that the independent variables work together in their effects; that is, that the independent variables interact with each other. The present chapter gives full examples in which two independent variables are involved and then describes how this can be extended to situations that entail more than two independent variables.
