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

APPENDIX B

EXAMPLE OF A GUIDE SPECIFICATION PERFORMANCE REQUIREMENT

The following is extracted from Joint Service Specification Guide, JSSG 2001, Air Vehicle, to illustrate one example of how a performance requirement can be expressed in a guide specification.  This requirement is for the aerial refueling envelope.  To highlight some of the characteristics common in a guide specification:

•  Notice that the requirement for the aerial refueling envelope in paragraph 3.1.1.1.1 below has two blank requirements that must be determined when developing the program-unique specification.

•  Guidance is provided below the requirement on how to fill in the blanks.  Even though guide specifications offer much flexibility in determining the performance capability, note that in the Requirements Guidance it indicates that if it is necessary to specify procedural operations, as a minimum, NATO STANAG 3971 and Allied Tactical Publication (ATP)

56, Air-to-Air Refueling, must be specified.  This is essential to ensure aerial refueling interoperability.

•  Notice the Lessons Learned paragraph for this requirement.

•  Notice the verification paragraph to determine compliance also has blanks for what inspections, analysis, simulation, demonstration, and test must be done; guidance for how to fill in the blanks; and direction as to which verifications must be done during System Requirements Review (SSR), System Functional Review (SFR), Preliminary Design

Review (PDR), Critical Design Review (CDR), First Flight Review (FFR), and System

Verification Review (SVR).

The complete JSSG 2001 can be accessed through the ASSIST database at https://assist.daps.dla/quicksearch/.

3.1.1.1.1 Aerial refueling envelope

The air vehicle shall be capable of aerial refueling operations throughout the     (1)     envelope in accordance with     (2)__.

REQUIREMENT RATIONALE (3.1.1.1.1)

This is a safety and operational compatibility requirement. For air vehicle-to-air vehicle refueling, the tanker and receiver air vehicles must have a similar airspeed and altitude envelope in which they can operate their aerial refueling subsystem(s) to facilitate successful aerial refueling. Likewise, for ship-to-helicopter in-flight refueling (HIFR), the air vehicle and ship must have a common operating envelope in which each can function during refueling. The specific aerial refueling procedures to be used during aerial refueling operations can dictate many of the design requirements of tanker and receiver aerial refueling subsystems. As such, it is necessary to

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