In plain terms. DIAR is the Department of the Interior's supplement to the FAR, adding Interior-specific contract rules.
Who it applies to. Contractors serving the Department of the Interior and its bureaus.
What it requires. Meet the FAR baseline, then DIAR additions. Interior handles land, resource, and some personal data, so expect safeguarding and handling terms appropriate to the program.
Why it matters. The sensitivity of Interior's data varies by program, but the FAR cyber baseline applies throughout.
Citation. DIAR, the Department of the Interior Acquisition Regulation supplement to the Federal Acquisition Regulation (FAR), codified in the FAR System at Title 48 of the C.F.R.