OASIS+ Phase II is fully underway now with rolling admissions that started in January 2026. OASIS+, short for One Acquisition Solution for Integrated Services +, is GSA’s premier Best-In-Class (BIC) contracting vehicle for highly complex, non-IT professional services.
OASIS+ has multiple functional domains that prospective vendors can apply for, and the technical evaluation components can differ greatly from domain to domain. The domains awarded to an OASIS+ contract holder will determine the bids they have access to on GSA eBuy, too, so it’s imperative that prospective contractors make an informed decision on what domains to pursue before they put their contract proposal together. Making this decision is exactly what this article will help you with.
Before we talk domains, it’s just as important that you as a prospective contractor understand what the OASIS+ pools are. Unlike GSA MAS—another major contracting vehicle—which consolidates all business types under one master Solicitation, OASIS+ has 6 different Solicitations under its umbrella, designed for different business set aside pools. The 6 OASIS+ pools are:
The Unrestricted category encompasses all Other Than Small Businesses, including non-profits, and small businesses that qualify in the scoring criteria can also apply for the Unrestricted category in addition to whatever other pools they may apply for. Small Businesses, determined by their applicable North American Industry Classification System (NAICS) Code size standards, can apply for the SB pool. The socioeconomic categories (8(a), WOSB, HUBZone, and SDVOSB) can only be applied for by businesses that have SBA certification in those categories.
OASIS+ uses functional domains to filter the types of bids that will be issued under the program. These domains also separate the vendors who will be competing on those bids from one another. OASIS+ Phase I released with 8 domains, and the current Phase II of the Solicitation added on 5 more. These are the current domains that prospective contractors can apply for:
You may know right away what the domain is that will likely best fit your scope of offered services. But how do you confirm tha t your past performance will align best with one domain over another, when there may be some overlap? And what do you do if your scope of services potentially fit multiple domains? To answer this question, let’s break down how GSA defines domain scopes and what all goes into demonstrating domain-relevant past performance.
While the OASIS+ domains describe technically distinct areas of professional services, a company may perform services that stretch across one or more of the service types described in the domains. If an OASIS+ applicant has contracts that span across Management & Advisory functions, Technical & Engineering, and Financial Services, how do they determine what their best fit is?
The first thing we need to understand are the parameters of the domain scopes. Domains are defined by NAICS Codes that OASIS+ has determined are applicable to the domain services category. These NAICS Codes, along with functional sub-areas that fall under each domain, can be found on GSA’s website.
A key factor of the technical evaluation is having projects that are automatically relevant to the domains being applied for. When you can present federal prime projects that are awarded under NAICS relevant to the OASIS+ domain you’re applying for, that makes the application process much easier.
Using NAICS Codes on past projects is a great way to determine the best domain fit for your offering, and it makes the technical evaluation more streamlined. However, there a lot of cases where this isn’t a good method. Maybe your contract was awarded under an IT NAICS even though it included in-scope professional services. Or maybe your contract portfolio consists of primarily commercial contracts and wouldn’t have any assigned NAICS.
When this is the case, don’t be deterred. OASIS+ allows applicants to demonstrate that their projects align with the domain scope by linking their project performance information, such as tasks found in the Statement of Work, with domain functional areas, or scope areas, that GSA defines on its website and in the Solicitation attachments.
Yes, applicants can apply for more than one domain. This can be done on the initial contract submission, and it can also be done post-award through a contract modification. Some contractors opt to apply for the domains they want all with the initial submission, which is certainly more work but will lead to faster access to the markets you’re targeting. Other contractors choose to focus on just one domain at submission to reduce the amount of documentation they will need to prepare; this is generally the lower risk option if your goal is to get on OASIS+ as fast as possible.
This annual average value is one key metric for the technical evaluation. As a Best-In-Class Vehicle, OASIS+ implements rigorous technical criteria that revolves around a central scorecard. This scorecard can be downloaded on the SAM.gov page for OASIS+ as a downloadable spreadsheet. Contractors must score 36 out of 50 possible points in the small business pools, and 42/45 out of 50 in the Unrestricted categories, depending on the domain.
The scorecard requirements do differ across domains, and because the scorecard acts a filter for entities applying, selecting the domain that will maximize the points your past contracts score can make or break your success applying for an OASIS+ contract.
If you’re interested in understanding more about the technical evaluation in terms of scoring guidelines and qualifying projects, refer to our blog post How to Select an OASIS+ Qualifying Project or GSA’s information page on OASIS+ qualifications.
If you’re thinking of applying for OASIS+, the most difficult part can be getting started – determining your domains, selecting your qualifying projects, and making sure the whole time you’re not going in the wrong direction. You might also want insight on whether OASIS+ would be a worthwhile effort to begin with based on the scoring criteria.
If you’re in this stage of planning and assessing risk, now is the best time to call on the experts that can help you understand the requirements, break down the scorecard, and evaluate your domain fit. Reach out to the Winvale team today to learn more about our capabilities in supporting you in this process.