Discretionary Dependencies
Discretionary dependencies are established by the project team based on knowledge of best practices, preferred sequencing, or past experience, even though other sequences are possible.
Explanation
Discretionary dependencies, also called preferred logic, preferential logic, or soft logic, are relationships that the project team chooses to implement but that are not physically or contractually required. They reflect the team's judgment about the best order to perform activities based on experience, industry best practices, or organizational standards.
For example, a team might decide to complete all design work before beginning any development work, even though some development could theoretically start before all designs are finalized. This sequencing preference creates a discretionary dependency. While it may reduce risk or improve quality, it is not an inherent requirement of the work.
Discretionary dependencies are important in schedule optimization because they can be modified or removed during schedule compression. When fast tracking, the project team looks for discretionary dependencies that can be relaxed to allow activities to overlap. However, changing discretionary dependencies increases risk, so the team must carefully evaluate the tradeoffs. All discretionary dependencies should be documented so they can be reviewed later if schedule changes are needed.
Key Points
- •Also called soft logic, preferred logic, or preferential logic
- •Based on best practices, experience, or team preference
- •Can be modified or removed for schedule compression
- •Should be fully documented for future review
Exam Tip
Discretionary dependencies are the ones you can change when fast tracking. They are based on preference, not physical or contractual necessity.
Frequently Asked Questions
Related Topics
Mandatory Dependencies
Mandatory dependencies are those that are legally or contractually required or inherent in the nature of the work, often involving physical limitations.
Fast Tracking
Fast tracking is a schedule compression technique in which activities or phases normally done in sequence are performed in parallel for at least a portion of their duration.
Sequence Activities
Sequence Activities is the process of identifying and documenting relationships among the project activities.
Schedule Compression
Schedule compression is a technique used to shorten or accelerate the project schedule duration without reducing the project scope.
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