The abbreviations that designate the modules, which are oriented towards specific functions within a company, consist of two letters. There are three modules at the top left for company logistics: SD for distribution logistics, MM for procurement logistics and stochastic materials management, and PP for deterministic materials management, scheduling and capacity management as used in production logistics. The modules contain sub-modules for the three temporal ranges (long, medium, and short term) and for the individual tasks. The functional separation between the MM and PP modules emphasizes the distribution of users between trade and production. It also betrays the fact that R/3 started out as an MRP II package.