SD-15 Guide For Performance SpecificationsThis document provides guidance information on performance specifications focusing primarily on stating requirements in performance terms and ensuring that sufficient verification means are included in the specification to evaluate conformance. While the focus of this document is on defense specifications developed under DoD 4120.24-M, Defense Standardization Program DSP Policies and Procedures, the principles and techniques can also be applied to program unique performance specifications, performance-based purchase descriptions, commercial item descriptions, or any other type of procurement specification. This guide is intended to supplement the format and content requirements for writing performance specifications found in MIL-STD-961, Defense and Program-Unique Specifications Format and Content.

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Performance Specification Guide SD-15

Specification Requirements	Performance Specification	Detail Specification
Section 3 - Requirements	The biggest differences between performance and detail specifications are in Section 3.
1. General	States what is required, but not how to do it. Should not limit a contractor to specific materials, processes, parts, etc., but can prohibit certain materials, processes, or parts when Government has quality, reliability, environmental, or safety concerns.	Includes "how to" and specific design requirements. Should include as many performance requirements as possible, but they must not conflict with detail requirements.
2. Material	Leaves specifics to contractor, but may require some material characteristics; e.g., corrosion resistance. May also prohibit the use of certain materials, hazardous or toxic substances, or environmentally damaging substances.	May require specific material, usually in accordance with a specification or standard.
3. Performance	States what the item or system shall do in terms of capability, function, or operation. Upper and lower performance characteristics are stated as requirements, not as goals or best efforts.	Detail specifications often have performance requirements. This can be risky, however, if other detail design requirements create a situation where it is not possible to meet the performance requirement.
4. Design	Does not apply "how to" design requirements, but should include requirement for design verification. Design verification is an integral element of performance specifications that the material and parts meet all performance requirements.	Includes "how to" and specific design requirements. Often specifies exact parts and components. Routinely states requirements in accordance with specific drawings.
5. Physical Characteristics	Gives specifics only to the extent necessary for interface, interoperability, environment in which item must operate, overall weight and envelope dimensions, or human factors.	Details weight, size, dimensions, etc. for item and component parts. Design-specific detail often exceeds what is needed for interface, etc.