28-06-2012, 01:20 PM
series of activities directed to accomplishment of a desired objective
activities directed .ppt (Size: 404.5 KB / Downloads: 179)
Introduction
Network analysis is the general name given to certain specific techniques which can be used for the planning, management and control of projects.
One definition of a project:
“A project is a temporary endeavour undertaken to create a "unique" product or service”
CPM - Critical Path Method
Definition: In CPM activities are shown as a network of precedence relationships using activity-on-node network construction
Single estimate of activity time
Deterministic activity times
USED IN : Production management - for the jobs of repetitive in nature where the activity time estimates can be predicted with considerable certainty due to the existence of past experience.
The Project Network
Use of nodes and arrows
Arrows An arrow leads from tail to head directionally
Indicate ACTIVITY, a time consuming effort that is required to perform a part of the work.
Nodes A node is represented by a circle
- Indicate EVENT, a point in time where one or more activities start and/or finish.
Activity Slack
Each event has two important times associated with it :
Earliest time , Te , which is a calendar time when a event can occur when all the predecessor events completed at the earliest possible times
Latest time , TL , which is the latest time the event can occur with out delaying the subsequent events and completion of project.
Difference between the latest time and the earliest time of an event is the slack time for that event
Positive slack : Slack is the amount of time an event can be delayed without delaying the project completion