How does an 'Indefinite Delivery, Indefinite Quantity' (IDIQ) contract differ from a 'GSA Multiple Award Schedule' (MAS) contract?

A GSA Multiple Award Schedule (MAS) contract is one specific type of Indefinite Delivery, Indefinite Quantity (IDIQ) contract that offers a broad range of commercial products and services, while other IDIQ contracts are typically agency-specific or for particular programs. An agency uses a GSA MAS contract when it needs to acquire commonly used commercial items or services, leveraging pre-negotiated terms and conditions. The GSA MAS contract is continuously open, allowing new offers to be submitted at any time. Other IDIQ contracts are usually established for a specific scope of work, often through a competitive solicitation, and awarded to a limited number of contractors. Agencies use these IDIQs for more specialized requirements or when they want more control over the contract terms and awardees. My company sells parts to DLA, and we see both types of contracting vehicles used depending on the item and the quantity needed. For instance, DLA uses IDIQ contracts for high-volume, long-term supply needs for specific National Stock Numbers (NSNs), while GSA MAS contracts might be used for common MRO parts.