"Shape Up presents “Wireframes are too concrete” and “Words are too abstract” as separate adjacent headings."
The official book places the two phrases as consecutive section headings rather than as one continuous sentence, so they should not be stitched together as a verbatim quotation. Fixed scope can prevent teams from reconsidering design decisions that prove more costly than they are worth. Detailed mockups can conceal implementation complexities that only become visible during development. Singer argues that vague project definitions make trade-offs difficult and allow scope to grow because the team lacks a clear boundary for what to leave out.
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