6. Dependencies
Least commonly used type of dependencies relationship.
Start to Finish (SF)
painting the walls must start for interior design can finish
Start to Finish (SF)
Land excavating must start before pouring concrete to build foundation
Start to Start (SS)
Fragment network diagram
"a portion of network diagram"
Types of Dependencies Relationship
* Finish to Start (FS) * Start to Start (SS) * Finish to Finish (FF) * Start to Finish (SF)
In this project schedule network diagram, the Finish to start relationship is depicted in activity
1.1.1.1 and 1.1.1.3. "We can't start putting cables in the wall ducts until we have cut the wall ducts and bought the cables."
Land must be purchased before building construction start
Finish to Start (FS)
Discretionary Dependency
A relationship that is established based on knowledge of best practices within a particular application area or an aspect of the project where a specific sequence is desired.
Most used type of dependencies relationship
Finish to Start (FS)
Lead
Allows the successor activity to start before predecessor ends.
Dependencies determination
Dependencies can be: Mandatory or Discretionary. Internal or External. Lead or Lags. Or Combination of each- example: mandatory external.
Dependencies.
Dependencies can occur in activities of project. Project activities dependencies include predecessor and successor activity.
Lag
Directs a delay in the successor activity
It is decided best to make door and window frames before the full structure of the wall is in place
Discretionary Dependency
Referred to as preferred logic, preferential logic, or soft logic.
Discretionary Dependency
Type of dependencies determination that usually outside the project team's control
External Dependencies
You need to ensure that the utility company has connected the electrical supply before the cable can be tested.
External Dependencies "Utility company is a non-project activity that is external".
Building the walls must finish before painting can finish
Finish to Finish (FF)
Discretionary Dependencies due to ....
Industry best practice or a desired sequence activity.
Mandatory Dependencies
Inherent in the nature of work such as physical limitations or may due to contractual obligation.
Type of dependencies determination that occurs between project activities, and the project team has some control over this dependency.
Internal Dependencies
The project team must create the software as part of the project's deliverable before the software can be tested for quality control.
Internal Dependencies "Internal relationships to the project or the organization".
The drywall should be complete before painting can start.
Internal dependency that is also mandatory
You must wait at least a month after pouring the concrete to let it dry and cure.
Lag "The waiting period of a month causes a lag for successor activity"
The driveway in front of the building has to be paved. The road-roller needs to begin rolling soon after the first section of asphalt is laid
Lead
You cannot start on first floor until foundation of building is complete
Mandatory Dependencies
Finish to Finish (FF)
Predecessor must finish before successor can finish
Start to Finish (SF)
Predecessor must start before successor can finish.
Start to Start (SS)
Predecessor must start before successor can start.
Finish to Start (FS)
The predecessor must finish before successor can start.
External Dependencies
The sequencing of project activities or tasks that involve relationships between project and non-project activities
Internal Dependencies
involve a precedence relationship between project activities and are generally inside the project teams control.