PROC PM is an interactive procedure that can be used for planning, controlling, and monitoring a project. The syntax and the scheduling features of PROC PM are virtually the same as those of PROC CPM; there are a few differences, which are described in Chapter 5: The PM Procedure. As far as the flow of data is concerned (see Figure 3.4), the PM procedure supports an additional data set that can be used to save and restore preferences that control the project view. The scheduling engine used by the PM procedure is the same as the one used by PROC CPM; the same macro variable, _ORCPM_, is used to indicate if the schedule was computed successfully.