The document describes a Lean Business Model Gameboard as a tool for developing and refining a business model. It presents the gameboard as having three sections representing the upstream, midstream, and downstream aspects of a business - the Enterprise Engine, Growth Engine, and Value Engine. The gameboard is intended to help users visualize their business as a 3-engine aircraft and guide them in creating, delivering, and capturing value at each stage of the business model. Mastery of the Lean Business Model Gameboard is described as key to the success and direction of an organization.