Our first pass of documenting our value stream should only consist of high-level process blocks. Typically, even for complex value streams groups can create a diagram with five to fifteen process blocks within a few hours. Each process block should include the lead time and process time for a work item to be processed, as well as the %C/A as measured by the downstream consumers of the output.‡ Figure 10: An example of a value stream map (Source: Humble, Molesky, and O’Reilly, Lean Enterprise, 139.)
