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Describe the Evaluation and Review Technique (PERT) for network planning and scheduling?

Explain how project scheduling software may help. Please explain my question.

All projects utilise several different resources to successfully complete the project successfully tothe customer or sponsors requirements.Resources add another dimension to planning and scheduling. This includes people, materials,equipment, tool, facilities and so forth.The quantity and availability of these resources are often limited and cause project to face risks orconstraints which needs to be managed carefully.With the above statements , differentiate between Resource smoothing and resourcelimited scheduling then to substantiate your answer by providing at least two (2) situations whereresource limited scheduling may occur