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GSA Schedule vs. OASIS+: What Each Contract Vehicle Means for Your Agency

GSA Schedule and OASIS+ are both federal contract vehicles, but they’re built for different kinds of procurement — and understanding the distinction matters when your agency is evaluating a staffing or services partner. GSA Schedule is a broad, multi-category vehicle covering everything from products to IT and professional services. OASIS+ is GSA’s dedicated vehicle for complex, non-IT professional and human capital services, organized into functional “domains” rather than a single catch-all category.

Here’s what each one actually means in practice, and why it’s worth knowing which vehicle a potential partner holds — and for what.

What Is the GSA Schedule (MAS)?

The GSA Schedule — officially the Multiple Award Schedule (MAS) — is a long-term, government-wide contract that pre-negotiates pricing, terms, and conditions between GSA and commercial vendors. Instead of running a full competitive procurement from scratch, your agency can purchase directly from an approved schedule holder through a streamlined ordering process.

MAS consolidated what used to be several separate schedules — including the schedule historically used for IT services — into one broader contract vehicle organized by Special Item Numbers (SINs) that define exactly what a given vendor is authorized to sell. It’s one of the largest and most widely used procurement paths in the federal government, covering tens of billions of dollars in annual sales across an enormous range of products and services.

What Is OASIS+?

OASIS+ (One Acquisition Solution for Integrated Services Plus) is GSA’s vehicle specifically for complex, non-IT professional services — think management consulting, human capital and training, logistics, engineering, and administrative or business support services. It’s organized into domains — functional groupings of related services, each tied to specific NAICS codes — rather than a single broad category the way MAS is.

OASIS+ consolidated several legacy contract vehicles, including the original OASIS contract, Building Maintenance & Operations (BMO), and Human Capital & Training Solutions (HCaTS). It also includes dedicated contract pools for small businesses and socioeconomic categories — including Women-Owned Small Business (WOSB) and Service-Disabled Veteran-Owned Small Business (SDVOSB) — alongside its unrestricted pool for larger contractors.

The Distinction That Matters Most

The most important thing to understand: OASIS+ is explicitly a non-IT services vehicle. The specific domain a staffing partner’s OASIS+ contract falls under can vary, so it’s worth confirming directly with that partner which domain or SIN applies to your specific requirement rather than assuming.

Knowing this distinction helps your procurement team ask the right question when evaluating a potential partner: not just “do you hold a contract vehicle,” but “which vehicle, under which domain or SIN, for which part of the work.”

Why This Matters When Selecting an IT Staffing Partner

A partner holding both GSA Schedule and OASIS+ gives your agency flexibility depending on how a requirement is structured and which NAICS code it falls under. It’s also worth knowing whether a partner’s OASIS+ position includes a socioeconomic pool like WOSB or SDVOSB, since that can matter for agencies working toward small business or socioeconomic contracting goals.

At the time of this article’s publication, Gridiron IT holds both a GSA Schedule and an OASIS+ contract. Contact us to confirm current contract details and the specific domain or SIN that applies to your agency’s requirement.

FAQ: GSA Schedule and OASIS+

Can a vendor hold both GSA Schedule and OASIS+ at the same time?

Yes. The two vehicles serve different scopes of work, so many contractors — particularly staffing and professional services firms — hold both to cover different types of requirements.

Is OASIS+ only for large businesses?

No. OASIS+ is structured into multiple contract pools based on business size and socioeconomic category, including dedicated pools for small businesses, WOSBs, and SDVOSBs, alongside an unrestricted pool for larger contractors.

Does OASIS+ replace the GSA Schedule?

No — they’re not interchangeable. GSA Schedule covers a broad range of categories including IT, while OASIS+ specifically covers complex non-IT professional and human capital services. Many contractors hold both to cover the full scope of what they offer.

Working With a Partner Who Holds the Right Vehicle

Understanding which contract vehicle covers which part of a requirement helps your procurement team move faster and with more confidence. A partner who holds both GSA Schedule and OASIS+ — and can speak clearly to which one applies where — is one less thing your team has to figure out mid-procurement.