The success or failure of a contract is almost always determined before the solicitation is even hit. It happens during the requirements definition phase. If you describe the requirement poorly, you will get a poor result.
In government contracting, we generally use one of three documents to tell industry what we need: the Statement of Work (SOW), the Performance Work Statement (PWS), or the Statement of Objectives (SOO).
While people often use these acronyms interchangeably, they represent fundamentally different philosophies on risk and control. Here is the definitive guide to PWS vs SOW vs SOO.
1. Statement of Work (SOW)
The “How-To” Manual
A Statement of Work is a design specification. It tells the contractor exactly how to perform the work, step-by-step. It is highly prescriptive.
- Focus: Process and Procedures.
- Risk: High Government Risk. If you tell the contractor exactly how to build a widget, and they follow your instructions perfectly but the widget fails, that is the government’s fault, not the contractor’s.
- Best Used For: Construction, R&D, or situations where the government has precise safety or technical processes that cannot be deviated from.
2. Performance Work Statement (PWS)
The “Gold Standard” (Performance-Based)
The PWS is the preferred method for service contracting under FAR 37.6. It describes the outcome required, rather than the method to achieve it.
- Focus: Results and Outcomes.
- Risk: Shared/Contractor Risk. You define “what” success looks like (e.g., “The floor must be clean and free of scuffs”), and the contractor decides “how” to achieve it (mops, buffers, robots).
- Key Component: It must be paired with a Quality Assurance Surveillance Plan (QASP) containing measurable metrics.
- Best Used For: Most service contracts (Janitorial, IT support, Grounds Maintenance).
3. Statement of Objectives (SOO)
The “Problem Statement”
The SOO is a very short document (often 2-5 pages) that provides the government’s high-level goals and asks the industry to propose the solution. It is not part of the final contract; instead, the winning contractor’s solution is converted into a PWS.
- Focus: High-level goals and innovation.
- Risk: Maximum Contractor Risk (and maximum flexibility).
- Best Used For: Situations where the government knows what problem it has but doesn’t know the best technology or method to solve it. It allows industry experts to innovate.
Summary Comparison
| Document | Describes… | Gov’t Control | Innovation |
| SOW | The Process (How) | High | Low |
| PWS | The Result (What) | Medium | Medium |
| SOO | The Goal (Why) | Low | High |
Which One Should You Choose?
If you want to shift risk to the contractor and encourage efficiency, move toward a PWS. If you are looking for a completely new way of doing business, issue a SOO. Only use a SOW if you are absolutely certain that you know the process better than the industry experts you are hiring.