Do you need customer support or technical assistance? Click here to submit a support ticket...

TOPIC: Mandatory vs. Internal dependencies

Mandatory vs. Internal dependencies 7 years 1 month ago #10298

  • Marc Rene Woerner
  • Marc Rene Woerner's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
  • Posts: 10
  • Thank you received: 0

Can someone please explain to me why the following example from the PMBOK Guide is NOT a Discretionary dependency?

PMBOK 5th, Page: 158:

For example, if the team cannot test a machine until they assemble it, this is an internal mandatory dependency. The project management team determines which dependencies are internal during the process of sequencing the activities.

Why isn't it both?

Mandatory and Internal dependency
"Mandatory dependencies are those that are legally or contractually required or inherent in the nature of the work."

Thanks in advance for your help.


Mandatory vs. Internal dependencies 3 years 9 months ago #23033

  • Rae Gasim
  • Rae Gasim's Avatar
  • Visitor
  • Visitor
Physical limitation is a mandatory dependency. I'm trying to clarify when a physical dependency is mandatory and also internal, which one do we choose

Mandatory vs. Internal dependencies 3 years 9 months ago #23038

  • Gabriella Dellino, PMP
  • Gabriella Dellino, PMP's Avatar
  • Offline
  • Gold Boarder
  • Gold Boarder
  • Posts: 266
  • Karma: 24
  • Thank you received: 93
Hi Rae,

I am not sure I understand your question correctly.
A dependence cannot be mandatory and discretionary at the same time; similarly, external and internal are mutually exclusive attributes. However, mandatory and internal are not mutually exclusive, so I don't see why to choose between the two.
Also, keep in mind that some dependencies may not fall in one of the two categories per se, but depending on the context. A dependency is not something "absolute", but it expresses a logical relationship between two activities. Do you have a specific example in mind?

Gabriella Dellino, PhD, PMP
PMPrepCast Community Moderator
Moderators: Yolanda MabutasMary Kathrine PaduaJohn Paul BugarinHarry ElstonJean KwandaDaniel SoerensenAlexander AnikinElena ZelenevskaiaChristian ElmerChristine Whitney, PMP

Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®