Does a great job of controlling for testing as a threat. It's more expensive and time consuming. Factorial Experimental Designs Designed to allow you to study two or more independent variables at a time. Interactions are important to study because we want to know if the treatment effects are the same for all or different for different groups. Single Subject Design Single subject design allows researchers to study individuals and the influence of an experimental treatment.
Individual behavior is recorded before and after a treatment.
Repeated measures are required to get a clear pattern of behavior over time. A baseline must be established. Multiple Baseline Design Taking multiple baselines in several subjects, areas, behaviors. Can use treatment in many situations and observe changes in behavior.