Need Answer

Problem with Calendar Analysis Simulation - Please help

Im using the simulation exercise in the "Modeler_user_Guide" and I have the following question:

Why, when I am simulating the process with 3 nurses the Resource Ocuppation level of them is something around 45% - 55% and when I create a calendar in the Calendar Simulation and put the same 3 nurses, the nurses resource % of drops down a lot!

Even in their material this is happening.

Please help!