Resource Infeasible 8-Day Schedule

Why is an 8-day critical path infeasible? Let’s take a look at the Gantt Chart. The number above each bar represents the number of people scheduled to work on that task. Add the numbers to the bottom for each day.

Note that we have a total workforce of only 4 people, but we require 5 people on days 3 and 4 to work the project as scheduled.