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Chapter 6 - Project Schedule Management

Terms in this set (86)

Dependencies may be characterized by the following attributes: mandatory or discretionary, internal or external. Dependency has four attributes:

Mandatory dependencies: Those that are legally, or contractually required or inherent in the nature of the work. Mandatory dependencies often involve physical limitations, such as construction project, where it is impossible to erect the superstructure until after the foundation has been built, or an electronics project, where a prototype has to be built before it can be tested.

Discretionary dependencies: Sometimes referred to as preferred logic, preferential logic, or soft logic. Discretionary dependencies are established based on knowledge of best practices within a particular application area or some unusual aspect of the project where a specific sequence is desired, even though there may be other acceptable sequences. For example, generally accepted best practices recommend that during construction, the electrical work should start after finishing the plumbing work.

External dependencies - Involve a relationship between project activities and non-project activities. These dependencies are usually outside of the project team's control. For example, the testing activity in a software project may be dependent on the delivery of hardware from an external source or governmental environmental hearings may need to be held before site preparation can begin on construction project.

Internal dependencies - Involve a precedence relationship between project activities and are generally inside the project team's control. For example, if the team cannot test a machine until they assemble it, there is an internal dependency.