I work in a large multi-bevearge company, in the IT PMO. We are underway implementing a new PPM tool, however, have decided we must first get our processes and methodologies right, before implementing a tool to help fix all our problems.
The one area my colleagues and I always get stuck on is scheduling the portfolio. Whether it be at scheduling effort for providing estimates for new projects, or actually doing the work, there is always uncertainty about how it will work in real life. The problem lies within cross-departmental priorities, and what would be the process for managing the day-to-day decisions without causing too much disruption to "in-flight" work.
If anyone has some good ideas, or could point to any articles or websites with information on Portfolio scheduling, then it will be greatly appreciated.