The right contract vehicle is rarely the one your contracting office defaults to. It's the one that matches your buy's profile — duration, volume, predictability, and eligibility constraints. Here's a quick decision tree.
GSA Multiple Award Schedule (MAS)
Use when: you have a one-time or moderate-volume buy, want pre-negotiated pricing, and don't want to run a full open competition.
Avoid when: you need true multi-year, recurring delivery with shifting scope — a BPA on top of MAS is usually better.
Blanket Purchase Agreement (BPA)
Use when: the same vendor will deliver recurring goods or services over multiple years, and you want negotiated terms locked once.
Avoid when: the scope hasn't stabilized — BPAs reward predictable, repeated buys. New programs should usually start narrower.
IDIQ (Indefinite Delivery / Indefinite Quantity)
Use when: program scope is multi-year and large, but task and delivery orders will vary.
Avoid when: the buy is small or one-time — IDIQ's overhead isn't worth it.
Cooperative & SLED
Use when: you're a state, local, or education buyer eligible to ride a cooperative contract another entity competed and awarded.
Avoid when: federal procurement rules apply — cooperative is a SLED tool.
Set-asides (8(a), SDVOSB, WOSB)
Use when: a set-aside path can speed award without distorting competition unreasonably, and a qualifying partner is available.
Avoid when: you have no eligible bidders or the timeline savings don't materialize.
The simplest test: name the buy's duration, volume, and recurrence in one sentence. If you can, the vehicle usually picks itself.
How Atlas helps
We help agencies score a buy against the vehicle options, model the total cost and time-to-award for each, and then deliver on whichever path is chosen — all on one consolidated quote.