DATA ITEM DESCRIPTION
Form Approved
OMB NO.0704-0188
Public reporting burden for collection of this information is estimated to average 110 hours per response, including the time for reviewing instructions, searching existing data sources, gathering and
maintaining the data needed and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including
suggestions for reducing this burden to Washington Headquarters Services, Directorate of Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the
Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington , DC 20503.
1. TITLE
SYSTEM/SUBSYSTEM SPECIFICATION (SSS)
2. IDENTIFICATION NUMBER
DI-IPSC-81431
3. DESCRIPTION/PURPOSE
3.1 The System/Subsystem Specification (SSS) specifies the requirements for a system or subsystem and the methods
to be used to ensure that each requirement has been met. Requirements pertaining to the system or subsystem's
external interfaces may be presented in the SSS or in one or more Interface Requirements Specifications (IRSs) (DI-
IPSC-81434) referenced from the SSS.
3.2 The SSS, possibly supplemented by IRSs, is used as the basis for design and qualification testing of a system or
subsystem. Throughout this DID, the term "system" may be interpreted to mean "subsystem" as applicable. The
resulting document should be titled System Specification or Subsystem Specification (SSS).
4. APPROVAL DATE
(YYMMDD)
941205
5. OFFICE OF PRIMARY RESPONSIBILITY
EC
6a. DTIC APPLICABLE 6b. GIDEP APPLICABLE
7. APPLICATION/INTERRELATIONSHIP
7.1 This Data Item Description (DID) contains the format and content preparation instructions for the data product
generated by specific and discrete task requirements as delineated in the contract.
7.2 This DID is used when the developer is tasked to define and record the requirements to be met by a system or
subsystem.
7.3 Requirements pertaining to system or subsystem interfaces may be presented in the SSS or in IRSs.
7.4 The Contract Data Requirements List (CDRL) (DD 1423) should specify whether deliverable data are to be delivered
on paper or electronic media; are to be in a given electronic form (such as ASCII, CALS, or compatible with a specified
word processor or other support software); may be delivered in developer format rather than in the format specified
herein; and may reside in a computer-aided software engineering (CASE) or other automated tool rather than in the form
of a traditional document.
7.5 This DID supersedes DI-CMAN-80008A and DI-IPSC-80690.
8. APPROVAL LIMITATION
Limited Approval from 12/5/94 through 12/5/96
9a. APPLICABLE FORMS 9b. AMSC NUMBER
N7074
10. PREPARATION INSTRUCTIONS
10.1 General instructions.
a. Automated techniques. Use of automated techniques is encouraged. The term "document" in this DID means a
collection of data regardless of its medium.
b. Alternate presentation styles. Diagrams, tables, matrices, and other presentation styles are acceptable substitutes
for text when data required by this DID can be made more readable using these styles.
(Continued on Page 2)
11. DISTRIBUTION STATEMENT
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
DD Form 1664, APR 89 Previous editions are obsolete Page 1 of 10 Pages
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