In the article linked here I talk about product definition (using the equity pyramid), product strategy, and product roadmap for SDG Games.
Dennis Furia, a corporate brand strategist turned game designer, has recently introduced the Board Game Equity Pyramid (similar in many ways to a Messaging Pyramid) as a tool for game designers to define the essence of their game, both to ensure they hit the target during development and to effectively communicate the value of the product in marketing efforts.
The product strategy (using the Purpose Pyramid) cascades off of the company’s business strategy and provides the direction necessary to more easily make product sequencing and timing decisions. The initial product roadmap lays out a hypothetical timeline for future game releases, linking planned milestones to the product vision and business objectives.