A PWS is the federal government's outcome-based alternative to a prescriptive Statement of Work. It defines the required results — what the contractor must deliver, at what quality, on what schedule — and leaves the technical approach, staffing model, and execution methods to the contractor. PWS-based acquisitions are governed by FAR Subpart 37.6 and are the preferred structure for performance-based service contracts. The PWS is paired with a Quality Assurance Surveillance Plan that defines how the government will measure performance against stated outcomes, and with measurable acceptable quality levels for each major service.
A well-written PWS has four structural elements: a description of required outcomes, measurable performance standards (quality, quantity, timeliness), an acceptable quality level for each standard, and the surveillance method used to verify performance. The PWS does not specify how to perform the work — that determination belongs to the contractor. This shifts technical risk to the offeror, which prices its proposed approach against the stated outcomes. The contractor's freedom to innovate is the core trade-off: the government accepts uncertainty about methods in exchange for accountability against measurable results.
For contractors bidding PWS-based work, the technical proposal must demonstrate the offeror's solution will reliably hit the AQLs. Generic capability statements do not satisfy a PWS competition — the proposal must walk the evaluator through the staffing, processes, and infrastructure that produce the outcomes. Pricing should fully load the cost of meeting the AQLs with margin for risk; PWS work that misses standards triggers fee reductions, deductions, or termination.