In January 2026, General Services Administration (GSA) released the Solicitation for Phase II of One Acquisition Solution for Integrated Services +, or OASIS+. Phase II is an expansion of the scope of Phase I by adding 5 new domains to the original 8, and by implementing continuously open, rolling admissions (for now). These changes represent a major change to how OASIS+ will fit into the overall strategy GSA has to centralize and streamline federal government procurement.
To better understand how OASIS+ fits into federal procurement, especially compared to other large-scale procurement vehicles like GSA Multiple Award Schedule (MAS), we’ll discuss how OASIS+ is different from other contracting vehicles and why neither OASIS+ or MAS are going anywhere.
GSA’s goal for OASIS+ is to use it as the premier vehicle to consolidate government procurement for professional services. OASIS+ Phase II is scaling up at a time when other large government contracting vehicles are expiring. These include the Facilities Building Maintenance & Operations contract and the Human Capital and Training Solutions (HCaTS) contract. These expiring contracts will be succeeded by the Facilities domain and Human Capital domain of the OASIS+ contract vehicle, respectively, which are two of the newly added domains in Phase II.
In addition to having OASIS+ adopt the federal work that is expiring on other large-scale contracts, GSA also wants to use OASIS+ to graduate agencies’ procurement standards into Best-In-Class (BIC) solutions.
BIC solutions are determined to be the highest performing contracts by the Office of Management and Budget (OMB); they are the highest maturity level (Tier 3) in the government’s Category Management framework. For reference, a Tier 0 would be an open market bid, a Tier 1 would be an agency-wide IDIQ, and a Tier 2 would be a government-wide acquisition vehicle like GSA MAS. The government’s goal is to move agencies’ procurement practices away from open market and agency-specific IDIQ contracts, and towards those Tier 2 and 3 contract solutions, like MAS and OASIS+, respectively.
As mentioned before, OASIS+ has added 5 new domains in Phase II in addition to the original 8 that were carried over from Phase I. Below is a list of all the domains that are currently open:
A key scope limitation of OASIS+ is that only allows non-IT professional services. GSA’s focus with OASIS+ is in consolidating procurement of professional services, especially because it administers other IT-focused GWACS, including Alliant 3, Polaris®, and 8(a) STARS III. GSA MAS, while not strictly IT-focused, is also a major vehicle for commercial IT products and services.
We’ve already discussed how OASIS+ is a Best-In-Class (Tier 3) contract vehicle, whereas MAS is not (although it is still a Tier 2, Multi-Agency Solution). We’ve also covered that OASIS+ is restricted to non-IT professional services (typically more specialized), while MAS allows IT services and products, professional services, and a host of other kinds of products and services. In addition to these differences, here are some other key differences between these two major GSA contracting vehicles:
|
Features |
MAS |
OASIS+ |
|
Solicitation Structure |
Unlimited contracts under a single Solicitation |
6 separate IDIQ contracts governed by distinct Solicitations: groupings are Unrestricted, Small Business, 8(a) SB, HUBZone, WOSB, and SDVOSB |
|
Scope Organization |
Special Item Numbers (SINs) determine type of product or service that can be offered |
Domains describe scope of services and contain multiple relevant NAICS codes |
|
Commerciality of Products/Services Offered |
Governed by FAR Part 12, Acquisition of Commercial Product and Services. Commercial Products and Services only |
Governed by FAR Part 15, Contracting by Negotiation. Commercial and non-commercial services allowed. |
|
Evaluation Methodology |
Contracts awarded to offerors that meet all Solicitation requirements – offerings are in scope of SIN applied for, offeror can demonstrate past performance in services SINs applied for, and pricing is determined fair and reasonable |
Offers must meet qualifying threshold using a combination of projects and corporate-level criteria. Unique evaluation factors based on domain and Solicitation pool. |
|
Small Business Representation |
Offeror determines preponderance of work NAICS code. Size status is determined based on the selected NAICS code |
Offeror must represent size status under each NAICS code applicable to them, based on domain they’re under |
|
Fees |
Industrial Funding Fee (IFF) of 0.75% is integrated into any sales on MAS |
0.15% Contract Access Fee for all federal agencies. |
|
Period of Performance |
5-year base with three 5-year option periods to a total lifespan of 20 years. Expiration based on the contract’s individual award date. |
5-year base with one 5-year option period. Task orders can extend the 10-year contract lifespan out up to 5 years and 6 months additional. Expiration date is coterminous for all contracts under the master OASIS+ contract |
Do you want to participate in one of GSA’s contracting vehicles, but don’t know whether OASIS+ or MAS is the right one? Or do you want to be on both, but don’t know which to prioritize? Here’s some considerations.
First, make sure that your offered services would fit the scope of both contract vehicles. As mentioned previously, OASIS+ does not allow IT professional services like MAS does, but it does allow non-commercial services in addition to commercial services, where MAS is tailored to commercial offerings.
OASIS+, as a BIC solution, uses a much more stringent technical evaluation that filters out many prospective contractors. Before you commit to an OASIS+ contract proposal, make sure that your past performance will stand up to the scorecard requirements of the OASIS+ Solicitation. Check out our previous article to understand more about this evaluation process.
A trickier evaluation process may push you towards MAS, which is a great option, but before you lock in that answer, also consider that OASIS+ is a newer vehicle, with more fanfare surrounding it, and GSA is positioning it to capture much of the professional services bids that federal agencies will be releasing in the coming years. In the fiscal year 2026, there have been 1000+ RFIs issued on eBuy under all business pools and domains for OASIS+. While it may be a more difficult Solicitation to qualify for, it also may be worth the risk of application due to the high volume of opportunities on it.
If you want more guidance on whether to pursue GSA MAS or OASIS+, or if you want to learn more about the contract proposal process for either, Winvale is here to help. We have a proposal writing team that has experience in both MAS and OASIS+: reach out today.