Node A6 · Acronym decoder
IDD
Interface Design Description
What it actually means
The document recording the as-designed detail of an interface — the concrete realization of what an interface requirements specification demanded. The IRS says what the interface must do; the IDD says what was built. Keeping them consistent is a classic configuration management chore.
Where you'll meet it
Software and system documentation trees, especially in MIL-STD-498 lineage.