Using P3M3, Prince2, Oracle's OUM, and other methodologies, we bring projects in on budget.
We're currently helping set up a portfolio management office for an Australian firm, providing advisory and process management skills to their team.
Methodologies are just one component of a successful system implementation, and the primary methodology that we use is people centred. We like to focus on the people who will be involved in a change, and work out how to bring them along on the journey.
Using too many Business Analysts on the client side doesn't work - fully engaging your full time members of staff in a project and backfilling them with temporary resources enables your people to get competent and familiar with new processes, organisation structures and technology that projects introduce.