1. The Problem.- 2. The Causal Model.- 3. Data and Methods.- 4. Correlational Data.- 5. The Individual as the Unit of Analysis— The Entire Sample.- 6. The Individual as the Unit of Analysis— The Four Categories.- 7. Analysis of the Nursing Units.- 8. Summary and Recommendations.- Appendix A: Questionnaire.- Appendix B: Measurement.- Appendix C: Correlation Matrices for the Four Categories of Nurses.- References.