A related type of hierarchy can be conceptualized with respect to decision making in inventory management and production planning and scheduling. At the highest level, one chooses a particular type (or types) of control system(s). At the next level, one selects the values of specific parameters within a chosen system (e.g., the desired level of customer service). Finally, one operationalizes the system, including data collection, calculations, reporting of results, and so forth (Brown 1982). p-945