After reading this chapter, you should be able to:
- Define and identify a quasi-experiment and a quasi-independent variable.
- Identify and describe two one-group quasi-experimental research designs: the posttest-only and pretest-posttest designs.
- Identify and describe two nonequivalent control group quasi-experimental research designs: the posttest-only and pretest-posttest designs.
- Identify and describe three time-series quasi-experimental research designs: basic, interrupted, and control designs.
- Identify and describe three developmental quasi-experimental research designs: longitudinal, crosssectional, and cohort-sequential designs.
- Define the single-case experimental design.
- Identify and describe three types of single-case research designs: the reversal, multiple-baseline, and changing-criterion designs.
- Identify in a graph the stability and magnitude of a dependent measure, and explain how each is related to the internal validity of a single-case design.
- Identify three ways that researchers can strengthen the external validity of a result using a single-case design.