Specification decisions lean on evidence that lives in scattered places: datasheets, appraisals, warranty terms, supplier claims, and office memory. Substitutions arrive late and get less scrutiny than the original choice. The reasoning behind "this product is fine here" rarely travels with the spec, so the next person has to rebuild it or trust it blind.
A card that assembles one product decision in one place. It holds the product's claims with a source label on each, the constraints and exposure limits that apply, warranty and documentation flags, and the open questions for the supplier or specifier. It can set one substitution beside the original and export the result as a decision card.
Pick a sample product, such as cladding, roofing, insulation, waterproofing, or a window system, then state the intended use and exposure. The card shows how well the product fits that use, what evidence supports it, what is constrained, and what is missing. Compare a substitution if one is on the table, then export the card for the project record.
The card never invents compliance. Every claim carries a source label or an assumption label, and a gap in the evidence shows up as a question, never as a quiet pass. The output supports a specifier's judgement; it does not stand in for the appraisal, the manufacturer's documentation, or the review.
Whether product evidence can travel with the specification. If the card works, the next person to touch the decision, in documentation, procurement, or on site, can see why the product was chosen, on what evidence, and what was never confirmed.