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last edited
by PBworks 18 years, 10 months ago
| Design | Threats to Internal Validity | Threats to External Validity | | One-shot case study | History, maturation, selection, and mortality | Interaction of selection and X | | One group pretest-posttest design | History, maturation, testing, instrumentation, interaction of selection and other factors | Interaction of testing and X. Interaction of selection and X. | | Time-series design | History | Interaction of testing and X | | Pretest-posttest Control-group design | None (mortality according to Dr. Bass) | Interaction of testing and X | | Posttest-only Control-group design | Mortality | None | | Solomon-four group design | None (mortality according to Dr. Bass) | None |
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