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21 January 2011

Four Logical Relationships of Project Management: What They Are and How To Use Them

David A. Zimmer
David A. Zimmer, PMP
Chief Project Professor
American Eagle Group

PMBOK® Guide  Definition

Logical Relationship: A dependency between two project schedule activities, or between a project schedule activity and a schedule milestone. The four possible types of logical relationships are: Finish-to-Start, Finish-to-Finish, Start-to-Start, and Start-to-Finish. See also precedence relationship.

Precedence Relationship: The term used in the precedence diagramming method for a logical relationship. In current usage, however, precedence relationship, logical relationship, and dependency are widely used interchangeably, regardless of the diagramming method used. See also logical relationship.

Practical Definition

Task relationships determine the start and finish dates of a task as it relates to other activities. The relations are labeled as Finish-to-Start, Start-to-Start, Finish-to-Finish and Start-to-Finish.

Expanded Definition