One of the three basic experimental design types used in empirical research in industrial and organizational psychology and related disciplines is quasi-experimentation. Quasi-experimental designs are different from both randomized experimental designs and nonexperimental designs (see the relevant entries in this volume). In the process of describing the nature of quasi-experimental designs, we make reference to a number of issues having to do with the validity of inferences stemming from research. These issues are covered in the entry on experimental designs in this encyclopedia. The reader is encouraged to review that entry prior to reading this one.

Attributes of Quasi-Experimental Designs

Quasi-experimental designs have a number of features. Taken together they serve to differentiate such designs from designs of the experimental and nonexperimental varieties.

Types of Quasi-Experimental Designs

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