CPM: Expanding the chart thru Data tasks
These days, data bases usually appear early in projects, whereas data shows up all over. Sometimes the data flows into data tables so that programs can process the data. Other times, programs read the data and put it some where. In some projects, the data controls how the programs run. Programs can also generate data as an output. Since data must exist on paper or on some device, each data store probably has a preliminary step or box.
Each box contributes details to the chart and time to the project. Even though much of the diagram resembles a process diagram, the steps in the process require set-up or configuration. When we criticize programmers for only seeing the mountain tops, we are highlighting the tendency to overlook or under-estimate the time required for these tiny tasks See CPM Menu and Security