An OASIS+ application requires domain selection, qualifying project narratives demonstrating relevant experience, past performance references, and submission through GSA's Symphony portal. GovCert automates domain matching, contract history mapping, and narrative generation for $1,000.
Last updated: April 2, 2026
OASIS+ (One Acquisition Solution for Integrated Services Plus) is GSA's next-generation government-wide acquisition contract for professional services. It replaced the original OASIS contracts and represents the single largest vehicle for professional services procurement across the federal government. Winning a spot on OASIS+ gives your company access to billions of dollars in task orders spanning management consulting, IT services, engineering, logistics, environmental services, and more.
The application process is conducted through GSA's Symphony portal and requires careful preparation. Unlike some federal certifications, OASIS+ is not a self-certification — it is a competitive evaluation based on your company's demonstrated experience, past performance, and organizational capability. This checklist covers everything you need to prepare a complete application in 2026.
Understanding OASIS+ Structure
OASIS+ is organized into domains that correspond to broad professional services categories. When you apply, you select which domains you are competing for based on your company's capabilities and contract history. You do not need to apply for all domains — in fact, you should only apply for domains where you have strong qualifying experience.
The OASIS+ Domains
- Management and Advisory: Strategy, program management, organizational development, and consulting services
- Technical and Engineering: Systems engineering, R&D, testing, logistics engineering, and technical support
- Scientific: Research, laboratory services, data science, and environmental science
- Intelligence Services: Analysis, collection management, and intelligence support
- Enterprise Solutions: IT modernization, cloud, cybersecurity, and digital transformation
- Environmental: Compliance, remediation, sustainability, and conservation
Contract Pools
Within each domain, OASIS+ has separate contract pools for small businesses and unrestricted (large business) competitors. Small business pools include designations for 8(a), HUBZone, WOSB/EDWOSB, and SDVOSB. If you hold one of these certifications, you compete in a less crowded pool with higher award rates.
Step 1: Verify Your Eligibility
Before you invest time in the application, confirm that your company meets the baseline requirements:
- Active SAM.gov registration: Your System for Award Management registration must be current and complete. This includes your NAICS codes, socioeconomic designations, and core competencies.
- DUNS/UEI number: Your Unique Entity Identifier must be active in SAM.gov.
- Relevant NAICS codes: You must have NAICS codes that align with the OASIS+ domains you are applying for. Review the OASIS+ solicitation for the specific NAICS codes mapped to each domain.
- Adequate accounting system: You need an accounting system that can handle cost-type contracts. For small businesses, a CPA letter confirming your accounting system's adequacy may be required.
- No active exclusions: Check SAM.gov to confirm your company has no active exclusions or debarments.
Step 2: Select Your Domains Strategically
Do not apply for every domain. GSA evaluates your application by domain, and a weak application in one domain does not help you. Focus on domains where you have the strongest qualifying project experience.
For each domain you select, you will need to provide qualifying project narratives that demonstrate relevant experience. The evaluation is pass/fail on minimum requirements, then scored competitively. The key criteria for domain selection:
- Do you have at least the minimum number of qualifying projects for this domain?
- Are those projects recent enough to meet the recency requirements?
- Do the projects demonstrate the scope and complexity that GSA is looking for?
- Can you provide verifiable past performance references for each project?
Step 3: Prepare Your Qualifying Project Narratives
This is the most important part of your OASIS+ application. Each qualifying project narrative must demonstrate that your company performed relevant professional services work at the required scope and complexity level. GSA evaluators score these narratives carefully.
What Makes a Strong Project Narrative
- Specificity: Do not write generic descriptions. Include specific deliverables, methodologies, team sizes, and measurable outcomes. "Provided IT support" is weak. "Migrated 3,200 users from on-premise Exchange to Microsoft 365 with zero downtime over a 14-week period" is strong.
- Relevance to domain: Every narrative should clearly map to the domain you are applying for. If you are applying for Management and Advisory, your narratives should emphasize strategy, consulting, and organizational outcomes — not technical implementation.
- Contract details: Include the contract number, contracting agency, period of performance, total contract value, and your company's specific role (prime or sub). GSA will verify these details.
- Complexity indicators: Highlight elements that demonstrate sophistication — multi-agency coordination, large dollar values, geographically distributed teams, complex stakeholder environments, or innovative approaches.
- Measurable outcomes: Quantify results wherever possible. Cost savings, efficiency improvements, user adoption rates, and schedule performance all strengthen your narrative.
Project Narrative Checklist
For each qualifying project, prepare the following information:
- Contract number and task order number (if applicable)
- Client agency and contracting officer name
- Period of performance (start and end dates)
- Total contract value and value of your company's portion
- Prime or subcontractor role
- Relevant NAICS code
- Project description (scope, deliverables, methodology)
- Measurable outcomes and results
- CPARS rating (if available)
- Past performance reference contact information
Step 4: Gather Required Documents
Beyond project narratives, OASIS+ requires several organizational documents. Prepare these well before you start the Symphony portal submission:
- Corporate experience matrix: A summary table of all qualifying projects mapped to the domains and NAICS codes you are applying for.
- Organizational chart: Showing key personnel, reporting structure, and relevant certifications or clearances.
- Financial statements: Two to three years of audited or reviewed financial statements. Revenue size matters for scoring in some pools.
- Accounting system documentation: Evidence that your accounting system can handle cost-type contracts, including CPA letters if applicable.
- Quality management certifications: ISO 9001, CMMI, or other relevant certifications can strengthen your application.
- Facility clearance documentation: If applicable to the domains you are pursuing, particularly for intelligence services.
- Socioeconomic certifications: Current 8(a), HUBZone, WOSB, or SDVOSB certifications if you are applying to a small business pool.
Step 5: Navigate the Symphony Portal
GSA uses the Symphony procurement portal for OASIS+ submissions. The portal is separate from SAM.gov and has its own registration and submission process.
Symphony Portal Tips
- Register early: Create your Symphony account well before the submission deadline. Account verification can take several business days.
- Save frequently: The portal has session timeouts. Save your work after completing each section to avoid losing progress.
- Follow character and file size limits: Each field in Symphony has specific character limits. Project narratives typically have word or character maximums that you must stay within. Draft your narratives in a separate document first, confirm they fit, then paste into the portal.
- Upload documents in the correct format: GSA specifies accepted file formats (typically PDF) and maximum file sizes. Confirm all documents meet these requirements before submission day.
- Submit before the deadline: Do not wait until the last hour. Portal traffic spikes near deadlines and technical issues are common. Aim to submit at least 48 hours before the window closes.
Common Mistakes That Get Applications Rejected
After reviewing feedback from OASIS+ evaluations, these are the most frequent reasons applications fail:
- Generic project narratives: Vague descriptions that do not demonstrate specific capabilities or outcomes. Evaluators need concrete evidence of your competence, not marketing language.
- Mismatched domains: Submitting IT implementation projects for Management and Advisory domains, or consulting narratives for Technical and Engineering. Each narrative must clearly align with its target domain.
- Unverifiable references: Providing past performance contacts who are no longer at the agency, have retired, or cannot be reached. Verify all reference contact information before submission.
- Incomplete SAM.gov registration: Missing NAICS codes, expired registration, or incomplete entity information. GSA cross-references your SAM.gov profile during evaluation.
- Exceeding character or page limits: Symphony enforces strict limits. Narratives that are cut off mid-sentence because they exceeded the character count will be evaluated as-is, potentially missing critical information.
- Missing the submission window: OASIS+ on-ramps open periodically and close on a fixed date. Late submissions are not accepted regardless of circumstances.
Realistic Timeline
Plan for a minimum of 6 to 8 weeks of preparation before the submission window opens. Here is a realistic breakdown:
- Weeks 1-2: Domain selection, qualifying project identification, and eligibility verification
- Weeks 3-4: Project narrative drafting and internal review
- Week 5: Document collection — financial statements, org charts, certifications, and past performance references
- Week 6: Symphony portal setup, data entry, and document uploads
- Week 7: Final review, reference verification, and compliance checks
- Week 8: Submission and confirmation
How GovCert Helps With OASIS+
GovCert's platform is expanding to support OASIS+ application preparation. The AI can analyze your existing contract portfolio, identify your strongest qualifying projects for each domain, and help draft compelling project narratives that meet GSA's evaluation criteria. If you are preparing for the next OASIS+ on-ramp, start with a free eligibility assessment to see which domains and pools you are best positioned to compete in.
Frequently Asked Questions
How many qualifying projects do I need for OASIS+?
The minimum number of qualifying projects varies by domain and pool. Generally, you need at least three to five qualifying projects per domain that demonstrate relevant experience within the recency period. Check the current OASIS+ solicitation on GSA's website for the exact requirements for each domain you are targeting.
Can I apply for multiple OASIS+ domains?
Yes. You can apply for as many domains as you have qualifying experience for. However, each domain is evaluated independently, so only apply for domains where you have strong qualifying projects. A weak application in one domain does not affect your evaluation in another, but it wastes preparation effort.
What is the Symphony portal?
Symphony is GSA's procurement portal used for OASIS+ submissions. It is separate from SAM.gov and requires its own registration. You use Symphony to enter company information, upload qualifying project narratives, attach supporting documents, and submit your application. Register early because account verification can take several business days.
When does OASIS+ accept new applications?
OASIS+ uses periodic on-ramp windows where new applications are accepted. These windows open on a schedule announced by GSA and have fixed deadlines. Late submissions are not accepted. Monitor GSA's Interact community and the OASIS+ program page for announcements about upcoming on-ramp opportunities.