These unrealistic expectations may be explained by the abbreviation PPC, which stands for Production Planning & Control, and by the term PPC system. These are used to describe both the actual task of planning & control and the software used to support this task. An opinion about one cannot be applied to the other. The same is true for the abbreviation SCM, which stands for Supply Chain Management, and by the term SCM system. The same problem arises for APS, which stands for Advanced Planning and Scheduling, and by the term APS system.