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Operations Research by P. Mariappan

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6

PERT - CPM

6.1  INTRODUCTION

A project comprises of interrelated activities, each contributing concurrently and or sequentially to the achievement of certain specific objA project comprises of interrelated activitiesectives. During the late 1950’s, PERT (MALCOLM, ROSEBOOM, CLARK, and FRAZER 1959) and CPM (KELLY and WALKER 1959) were developed to provide a tool to enhance the effectiveness of the three phases planning, scheduling and controlling of a project management.

Basically, PERT and CPM represent one and the same technique. PERT assumes that for each activity the duration (activity time) as a random variable, whereas CPM uses known fixed activity timings.

The planning phase leads to the construction of a network that represents the activities ...

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