When there is a need for:

Visibility of project investments and whether they are delivering the organisation’s strategic objectives is missing
The project investment budget needs to change and the right ones must be retained
Assessment of an acquisition’s project investment portfolio; whether it adds value or costs.
Get control of project investments that are not delivering the expected returns
Select tools to support your portfolio management activities
Develop the case for building a portfolio management capability
Support to drive a portfolio management initiative or oversee a software vendor