This paper describes the characteristics and circumstances defining nine decision cases in an effort to provide methodological assistance for practitioners. Each case is examined according to its objectives (single or multiple), resource level (limited or unlimited), time frame (a priori or evaluative), and the nature of desired decisions. In cases 1, 2, and 3, the decision-maker considers activity-designs. The complexity of cases 4, 5, and 6 mandates more detailed analysis. Here the notions of tasks and program-packages (sets of tasks) are introduced. In cases 7, 8, and 9, the term activity is used to connote the same overall meaning as program-package. These distinctions are necessitated by analytic complexities arising out of a need to derive an optimal decision-variable for each case. Decisions made by the decision-maker are at the level of activity-design for cases 1 and 2, program-package for cases 4 and 5, and activity for cases 7 and 8. The case discussion is preceded by an introductory exhibit showing the evolutionary structure of the nine cases. (Author)