eight factors related to internal validity of experimental and quasiexperimental designs: (a) history, (b) maturation, (c) testing, (d) instrumentation, (e) statistical regression, (f) differential selection, (g) experimental mortality, and (h) selection-maturation interaction.
If the instrument is unique to this study, discuss the procedures to be used to pilot test the study. Present pilot test results in Chapter 4 or the results section prior to presentation of the study results.