So you’ve optimized Kanban at the team level but true to the Theory of Constraints its uncovered new challenges. Cross team dependencies block progress for one team at the expense of another. Individual backlogs create competing priorities for critical resources. Roadmaps for what to work on next are out of date before you can hit print.
Sounds like you need to expand your Kanban. While this may seem like the solution to all the same problems you had at the team level, lets dig into what patterns are different at the portfolio level. Soloed team expertise, fear and hidden work, lack of visibility across projects, and optimization for one problem without regard for another. But as the system matures you will see status meetings disappear, impromptu gatherings around the board, organizing around the highest priority work and more informed decision making.
You aren’t the first organization to be here, so let’s talk about what organizations before you have learned. There are clear patterns in the evolution of portfolio Kanban, let's break down what you can expect along the way.