Example

The network in the figure is for a project in which the key resources is engineers. The network has been evaluated on the assumption that an unlimited number of engineers is available and the duration of the project is then $28$ days as shown.

Resource aggregation:

$1-$draw the histogram showing the demand for engineers and schedule the start of each activity if only $3$ engineers are available and determine the effect on the project duration.

Assume in this case that no activity can be split.draw $($resource vs duration for $3$ engineers available$)$knowing that The duration of the project will increase to $30$ days