Resource levelling is a benefit of CPA in that you find the sequence of jobs that are critical to the continuity and completion of the job on time. For example you cannot start your roof construction until your walls are built.
Certain jobs take certain time spans and you cannot start the next stage of construction until each critical stage is complete. You can although plan the none critical jobs around the critical ones allowing complete utilization of the workforce and hence keep all the staff busy working towards the final goal!
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