Project Management - unideb.hu

Project Management - unideb.hu

Drawing the AON network Project Management (lecture) Elements of an AoN diagram Activity (node) Work element or task

Name or identification of the tasks must be added No need for dummy (unreal) activities Dependency or sequence arrow Shows the interrelationship between activities

Conventions Time flows from left to right Arrows direction Labels increase Head nodes always have a greater/higher label (letter) that of the tail node.

A complete network has only one starting and only one ending event. Examples of activity combinations Graphical representation

Representation of dependency time: lags Activity duration times & finish to start dependency Representation of milestones/deadlines (external constraints): Identified by an inverted triangle over the activity node (occasionally with an imposed time for the

event) Overlapping activities If the activities are not fully discrete The second activity can start before the first is completed but not before it is at least partly completed.

Breaking activities into components Interfacing When an activity is common to two or more subnetworks it is said to be an interface activity between those subnetworks and is represented by a pair

of concentric circles or rectangles. Two errors in logic Looping: underlying logic must be at fault Dangling: an activity is undertaken with no result

Hammock activities Artificial activities created for the representation of the overhead cost with the aim of cost control. Embrace activities belong to the same cost centre Zero duration time (not taking part in the time

analysis) Overhead cost rate is assumed to be constant over the life of the hammock. Multiple starts and finishes Only used in computer programs All starting activities can occur at the start

and all finish activities will occur at the end of the project. CPA, CPM and PERT Critical Path Analysis (CPA), Critical Path Method (CPM) deterministic with only one estimation

Program Evaluation and Review Technique (PERT) probabilistic with three estimated durations Readings Lockyer Gordon (2005) Chapter 12

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