It is critical that we understands the various Project-Hierarchy-Levels of a project. That one understands how one Project-Hierarchy-Level Supports another, and is supplied by others. It is critical that we do not mix the levels together.
Use the VDT to map the interactions from one Project-Hierarchy-Level to another.
see Illustration above.
For a Product-Level (Sailboat), there are Stakeholder-Levels above (Buyer, Sales, Insurance etc.) that justify the Product-Levels existence, and Sub-Product Levels (Hull, Rig, Mast) below that Supports or make up the whole Product-Level.
The Sub-Product (Hull), must support the Product-Level, and are delivered through Solutions (Hull shape, Glass-fiber, Epoxy, White Paint)
Product-Level: MTBF (Mean Time Between Failure)
Solution: Hull-Shape, Glass-fiber