I agree these don't fit into the 4Ds because the spec is many times the contractual document used for handover compliance line item by line item as part of a la

I agree these don't fit into the 4Ds because the spec is many times the contractual document used for handover compliance line item by line item as part of a larger RFP. Much of it should end up in permanent operational documents but you keep the baseline fixed (with amendments) to compare the original intent against what you end up with. Still, I'm not sure this matters enough to add another D to the taxonomy. If I was to add one it would be D for Diagrams which matter enough to be a category of their own ;}