A project may depend on other projects:

- In a ‘positive' way: a project is a prerequisite of another, and one of its deliverable can be required to build the next project deliverable (this is equivalent to a logical AND: both project must be carried out);

- In a ‘negative' way: a project can be identified as redundant or exclusive with respect to another project (this is equivalent to a logical XOR: only one of the two projects should be carried out, not both).

HOPEX Project Portfolio Management, HOPEX DoDAF V2.