U.S. General Services Administration

Contracts to Meet 

Your Professional 

Services 

Requirements

Buying Professional Services through the Multiple 

Award Schedule or OASIS

GSA offers two contracts that can meet any professional services 

requirement regardless of complexity and scope: the Professional Services 

under the Multiple Award Schedule (MAS) Professional Services Category

 and One Acquisition Solution for Integrated Services (OASIS).

Add value to the acquisition process by saving time and costs to focus 

on your mission needs. MAS Professional Services Category and OASIS 

reduce procurement lead times 

and administrative costs commonly 

associated with acquiring professional 

services. Leverage GSA contracts 

to meet small-business goals and 

maintain regulatory compliance while 

capturing spend under management 

(SUM) contract credit.

For More Information

• Visit GSA Interact’s Professional 

Services Category Community

• Visit the Acquisition Gateway’s 

Professional Services Hallway
Professional Services 

(PS) on MAS

OASIS and OASIS

Small Business (non-MAS)

Small Business • Thousands of small-business contractors are available and task orders 

may be set aside for competition on

 any small-business type listed in FAR 19.00(A)(3)

• Schedule contractors may form Contractor Team Arrangements (CTAs)

• Subcontracting permitted using prime contractor’s Authorized 

Schedule Pricelist

• Limitation on subcontracting applies to each order set aside for 

small-business competition

• Sole-source direct order awards for socioeconomic purposes not 

permissible under MAS

• OASIS Small Business (SB) contains a select number of small-business 

contractors suitable for requirements that will be set aside

• Prime OASIS contractors may form FAR 9.601(2) Prime/Sub CTAs

• Limitations on subcontracting are managed at the contract level by 

default, but may be required in the order at the ordering contracting 

officer’s discretion

• OASIS SB has multiple NAICS-code pools to ensure proper smallbusiness use and agency award credit

• OASIS SB allows for competitive socioeconomic set-asides

• Sole source (direct) order awards permissible under the 

OASIS 8(a) Subpools

Contract Type Fixed-price, labor-hour, and time-and-materials (T&M) task 

orders only 

All contract types are allowed, including fixed-price, labor-hour, timeand-materials, cost-reimbursement, and hybrids of these types

Commercial or 

Non-Commercial

Commercial requirements only Both commercial and non-commercial requirements

Contractor Reporting Track performance on MAS Schedule Sales Query at

https://d2d.gsa.gov/report/fas-schedule-sales-query-plus-ssq

Track OASIS performance on our dashboard at 

www.gsa.gov/oasis (under the “Research Tools” heading)

BPAs • Offer streamline ordering and improved discounts in accordance with 

FAR 8.405-3

• Find checklists on how to establish single-award or 

multiple-award BPA

• No authority to establish BPAs

• The flexibility of establishing optional CLINs is permissible 

• The flexibility of establishing T&M and cost-type orders with 

incrementally funded technical direction is permissible

Order Options • May be exercised after Schedule contract expiration

• May not extend beyond five years after Schedule contract expiration

• Designed for long periods of use 

• Task order can be awarded through 2024

• Task order Period of Performance is through 2029

Protests Protest at any order dollar value • Not allowed for any in-scope order less than $10 million

Other Direct Costs 

(ODCs) and Order Level 

Materials (OLMs)

OLMs are limited to 33 percent of the initial task order scope 

(OLMs are allowed at the task order level if the contract has been 

awarded the SIN) – see the OLM website

• All ancillary support items may be included in a single OASIS task order

• Maximum flexibility for ancillary support 

• Labor and materials

• ODCs

Delegation of 

Procurement Authority 

(DPA)

A DPA is not required to use the GSA Schedule DPA needed – please visit www.gsa.gov/oasis to secure training

Task Order Size • No minimum or maximum order limit Minimum order is the simplified acquisition threshold; no maximum limit

Ordering Procedures FAR 8.405

See FSS Award and Order Topic Checklists:

How to issue an FSS order for Professional Services

• FSS Order Checklist

How to issue an order under an established FSS BPA for 

Professional Services

• FSS BPA Order Checklist

How to establish a multiple-award FSS BPA for Professional Services

• FSS Multiple Award BPA Establishment Checklist

How to establish a single-award FSS BPA for Professional Services

• FSS Single Award BPA Establishment Checklist

FAR 16.505

See OASIS Ordering Checklist under How to Use OASIS

How to issue an OASIS task order

• OASIS Order One Page Checklist 

Spend Under 

Management (SUM)

Tier 2, Multi-Agency Solutions – dollars obligated on multi-agency 

contracts that satisfy rigorous standards set for leadership, strategy, data, 

tools, and metrics

Tier 3, Best-in-Class (BIC) Solution – dollars obligated on 

Best-in-Class contracts

Contact Information Website: www.gsa.gov/masprofessionalservices

Email: ProfessionalServices@gsa.gov

GSA’s National Customer Services Center phone: 800-488-3111

Current announcements/postings:

https://buy.gsa.gov/interact/community/5/activity-feed

Website: www.gsa.gov/oasis

Email: OASIS@gsa.gov

GSA’s National Customer Services Center phone: 800-488-3111

Current announcements/postings: 

https://buy.gsa.gov/interact/community/17/activity-feed

www.gsa.gov

December 2022

05-23-00321

View, download, and order publications via www.gsa.gov/cmls.