An available supplier is not automatically the authorized buying route. Check required sources, ordering rules, and defense-specific conditions before treating a catalog listing as a complete acquisition solution.
This guide explains DFARS Part 208: Required Sources of Supplies and Services. Read the relevant coverage with the FAR, applicable supplements and deviations, and the actual solicitation or contract.
Watch the DFARS Part 208 lesson
Start with the source route
Section 208.002 points planners to DoD inventory guidance, coordinated acquisition, and enterprise software agreements. Subpart 208.70 distinguishes acquiring and requiring department responsibilities and includes stated exceptions. A customer need and a willing vendor do not, by themselves, resolve which source or department should handle the acquisition.
Read schedule-order conditions
Sections 208.404 and 208.405 supplement Federal Supply Schedule ordering. Relevant topics include certain one-offer situations, foreign acquisition, and applicable supplier-risk considerations. The source page also identifies a pricing class deviation. A schedule contract does not eliminate the ordering activity’s responsibility to apply the current rules to the particular order.
Check enterprise software coverage
Subpart 208.74 covers designated commercial software and related services, including several acquisition routes. It connects DoD requirements with the Enterprise Software Initiative, while explaining that ESI does not dictate which product or service to acquire. Separate product selection, available agreement coverage, and the authority or procedures for placing the order.
A hypothetical example
Consider a fictional software reseller preparing a quote for a defense customer. The product appears on a schedule, and the customer wants maintenance included. The sales team assumes the listing answers every question about the purchase route, pricing, and the customer’s internal approval process.
Before finalizing the response, the team identifies the specific products and maintenance, the proposed ordering vehicle, and any applicable enterprise agreement coverage. It checks the actual request and asks the authorized contact to resolve unclear buying-route assumptions. The company supports its quoted scope and pricing without claiming to make the Government’s source or approval determination.
The revised package keeps the product, license or maintenance scope, agreement, and ordering instructions connected. This fictional example does not select a required source or determine price reasonableness. It shows how a supplier can reduce rework by making its assumptions explicit before the customer relies on the quote.
Avoid the shortcut
Do not promise that being on a schedule makes every order straightforward or automatically compliant. The requirement, acquisition method, source priorities, current deviations, and order-specific conditions still matter. If the quote relies on an unresolved route or agreement assumption, flag it clearly rather than presenting that assumption as established authority.
Try this exercise
Review one hypothetical software-and-maintenance quote. Identify the proposed product, associated services, schedule or agreement, and the source of the ordering instructions. Mark each point as verified or unresolved. Explain which questions belong to your business and which require the Government ordering activity’s determination.
This worksheet is a GovSuccess preparation practice, not a prescribed Government form or a determination of compliance.
- Requirement and requested supplies or services
- Required-source and inventory questions
- Proposed ordering route
- Ordering and acquiring responsibilities
- Applicable agreement or schedule coverage
- Pricing and scope support
- Open conditions and authorized contact
- Verified instructions and next step
Official source and applicability
DFARS Part 208 — official text. The source page displays DFARS Change 5/7/2026, effective May 7, 2026. Check later changes and the requirements applicable to your acquisition. Route material interpretation questions for qualified review.
Build your readiness baseline
Explore GovAssessment for a structured business-readiness baseline based on your answers. It does not certify compliance, approve a contract action, or guarantee an award.
General education, not legal advice. Browse the DFARS series.
