Vertical: construction — don't spec it naive

Construction has its own money physics. A spec that treats a contractor's billing like a SaaS invoice will ship something no contractor can use, because the cash flow it ignores (retainage held back, draws against a schedule of values, subs gated on lien waivers) is the thing the contractor is trying to manage. This skill gives architect and pm the vocabulary and the non-obvious rules so the four construction products are specced from domain reality, not intuition.

The four products and their incumbents: