136 Managing projects as investments: Earned value to business value
given time period, we still don’t know where unavailability may affect
our schedule. This requires the comparison of two different databases:
1. A database of resource needs for our project, time period by time period.
This comes from having input the resource needs for each activity
in the WBS and then scheduling each activity through CPM.
2. A database of resource availability for our project. This database is often
called a resource library. It contains crucial information for project
performance and must be kept up to date as assignments change,
stafng levels vary, and employees come and go.
The resource library, and the practice of comparing the project sched-
ules to ...