The Portfolio Kanban system is a method to visualize and manage the flow of portfolio Epics, from ideation through analysis, implementation, and completion. The Portfolio Kanban system is operated by the Lean Portfolio Management (LPM) function, which is responsible for strategy and investment funding, Agile portfolio operations, and Lean governance. The LPM function consists of three collaborating roles: the Enterprise Architect, the Lean Portfolio Manager, and the Operational Excellence Manager. The LPM function uses the strategic portfolio review and portfolio sync events to manage and monitor the flow of work in the Portfolio Kanban system. References: Portfolio Kanban - Scaled Agile Framework, Lean Portfolio Management - Scaled Agile Framework