We started the delivery assurance process on the whole portfolio where the initial objective was to know the status of the projects.
After we knew the general status and evolution of them, the next need at portfolio level was clear: now we can prioritize the projects and start opening relevant actions on the key projects.
Resources are limited, so enable actions for all projects is neither effective nor efficient.
We use an easy reporting scheme o it: Actions performed in this period,Actions not performed in this period,Actions to be performed in the next period.
Pareto law says something like this: with 20% of actions you can solve 80% of problems. I try to help on this.