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activity links

Activity constraints: Limiting the degrees of freedom of project activities

Activity constraints can be imposed when there is a need to control the start or finish of an activity in a project schedule. In this article, three types of commonly used activity constraints will be discussed along the following dimensions:

Project networks: Nodes and arcs or arcs and nodes?

A project network consists of a set of nodes and arcs. A project contains activities and precedence relations to model technological relations between pairs of activities. A project network can be represented in two formats, which is the topic of this article, as follows:

Activity links: The equivalence of minimal and maximal time-lags

A project network consists of a set of activities, represented as nodes in a network between which links are drawn to represent the technological precedence relations between these project activities (see “Activity links: How to add precedence relations between activities?”). 

These precedence relations can be one out of four types (start-start (SS), start-finish (SF), finish-start (FS) and finish-finish (FF)), with a positive, zero or negative time-lag to express a minimal or a maximal time window between two activities.

Activity links: How to add precedence relations between activities?

A project network consists of a set of activities, represented as nodes in a network between which links are drawn to represent the technological precedence relations between these project activities. In figure 1, a finish-start precedence relation between activities 1 and 2 is used to imply that activity 2 can not start earlier than the finish of activity 1.

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