The document discusses lean planning approaches for complex environments, including flow-based roadmaps, options thinking, and development planning models. It advocates using a flow-based roadmap laid out with real options from which to choose based primarily on benefits while considering risks and understanding just enough about costs to get started. Various techniques are presented for visualizing work, limiting work-in-progress, and measuring progress intentionally. Benefit mapping and weighted scoring rubrics are described as ways to evaluate options.