1. Define a factorial research design, including the terms factor and level, and identify and describe factorial designs when they appear in a research report.

2. Define the goal or purpose of the correlational research strategy and distinguish between a correlational study and experimental and differential research.

3. Describe the goal of single-case research and explain how single-case designs are related to other experimental designs, the descriptive case study, and thequasi-experimental time-series design.