Node A6 · Acronym decoder
SDD
Software Design Description
What it actually means
The document (or model) recording a software item's design — architecture, components, interfaces, data structures — the how that answers the SRS's what. In document-driven lineages it's a formal CDRL deliverable; in modern practice the content increasingly lives in models and repositories, but the traceability obligation is unchanged.
Where you'll meet it
Software documentation trees and design reviews.