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CHAPTER TENQuasi-Experimental Designsand Program EvaluationCHAPTER OUTLINEOVERVIEWTRUE EXPERIMENTSCharacteristics of True ExperimentsObstacles to Conducting True Experiments in Natural SettingsThreats to Internal Validity Controlled by True ExperimentsProblems That Even True Experiments May Not ControlQUASI-EXPERIMENTSThe Nonequivalent Control Group DesignNonequivalent Control Group Design: The Langerand Rodin StudySources of Invalidity in the Nonequivalent ControlGroup DesignThe Issue of External ValidityInterrupted Time-Series DesignsTime Series with Nonequivalent Control GroupPROGRAM EVALUATIONSUMMARY309

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