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
6. Interface, Interoperability, and Compatibility Requirements	Similar for both detailed and performance specifications. Form and fit requirements are acceptable to ensure interoperability, interchangeability, and compatibility.
7. Processes	Usually does not specify processes, but if it does, the requirement is stated as the desired outcome from a process, requires the contractor's normal commercial processes, or is provided as guidance.	Often specifies the exact processes and procedures to follow -- temperature, time, and other conditions -- to achieve a result; for example, tempering, annealing, machining and finishing, painting, welding, and soldering procedures.
8. Parts	Does not require specific parts.	States which fasteners, electronic piece parts, cables, sheet stock, etc. will be used.
9. Construction, Fabrication, and Assembly	Usually does not specify construction, fabrication, and assembly requirements.	Describes the steps involved or references procedures which must be followed; also describes how individual components are assembled.
10. Operating Characteristics	Omits, except very general descriptions in some cases.	Specifies in detail how the item shall work.
11.Workmanship	Very few requirements	Specifies steps or procedures in some cases.
12. Reliability	States reliability in quantitative terms. Must also define the conditions under which the requirements must be met. Minimum values should be stated for each requirement, e.g., mean time between failure, mean time between replacement, etc.	Often achieves reliability by requiring a known reliable design.