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Acronym	Definition
AADL	Architecture Analysis & Design Language
ACM	Association for Computing Machinery
ADPE	Automated Data Processing Equipment
ALB	Automated Link Builder
AM	Asset Management
AoA	Analysis of Alternatives
APPEL	Academy of Program/Project and Engineering Leadership
APPS	Agency Principles and Processes
ARC	Ames Research Center
ATMOS	Atmospheric Trace Molecule Spectroscopy
ATTR	Acceptance Test Readiness Review
BiCE	Best-in-Class Example.
BIT	built in test
BOE	basis of estimate
BP	Best Practice.
BPR	Baseline Performance Review
BSP	Board Support Package

Acronym	Definition
C & I	Coding and Integration
CAB	Change Authorization Board
CAD-CAM	Computer-Aided Design/and Computer-Aided Manufacturing
CADRe	Cost Analysis Data Requirement
CAS	Credibility Assessment Scale
CCB	Change Control Board or Configuration Control Board
CCP	Commercial Crew Program
CDR	Critical Design Review
CE	Chief Engineer
CEP	Complex Event Processing
CER	Code Error Rate or Cost Estimating Relationship
CHMO	Chief Health and Medical Officer
CI	Configuration Item
CIO	Chief Information Officer
CLCS	Checkout Launch Control System
CMMI-DEV	Capability Maturity Model® Integration® (CMMI®) for Development
CMP	Configuration Management Plan
CMU	Carnegie Mellon University
CO	Contracting Officer
COCOMO	Constructive Cost Model
COOP	Continuity of Operations Plan
CoP	Community of Practice
COR	Contracting Officer Representative
COTR	Contracting Officer Technical Representative
COTS	Commercial Off the Shelf
CPU	Central Processing Unit
CR	Change Request
CSA	Configuration Status Accounting
CSAFS-SAFS	Central/Standard Autonomous File Server
CSC	Computer Software Component
CSCI	Computer Software Configuration Item
CSMA	Center SMA
CSU	computer software unit
DACUM	Developing a Curriculum
DAR	Decision Analysis and Resolution
DAS	Demand Access Service
DBMS	Database Management System
DCD	Data Capture and Delivery
DCR	Database Change Request
DDAS	Digital Data Acquisition System
DDI	Data Delivery Interfaces
DDP	Digital Data Processor
DDS	Detailed Design Specification
DGA	Designated Governing Authority
DID	Data Item Description
DLA	Design Logic Analysis
DO	Defense Order
DoD	Department of Defense
DoDAF	Department of Defense Architecture Framework
DPC	designated point of contact
DR	Discrepancy Report
DRAM	Dynamic Random Access Memory
DSRC	Dryden Space Research Center
DSS	Data Storage & Staging
DTF	Development and Test Facility
DTN	Delay Tolerant Network
DTR	Detailed Technical Review

Acronym	Definition
EC	Equipment Cost(s)
ECB	Engineering Change Board
ECC	Emergency Control Center
ECP	Engineering Change Proposal
ECR	Engineering Change Requests
EDG	Edison Design Group
EDL	Entry, Descent, and Landing
EEE	Electrical, electronic, and electromechanical
EEI	Engineering Excellence Initiative
EEPROM	Electrically Erasable Programmable Read-Only Memory
EET	End-to-End Test
ENC	Encoding/Decoding
ER	Enhancement Report
ETA	Engineering Technical Authority
EVA	Extra Vehicular Activity
FAQ	Frequently Asked Questions
FAR	Federal Acquisition Regulation or Federal Acquisition Requirement
FCA	Functional Configuration Audit
FDC	Failure Detection and Correction
FDIR	Fault Detection, Isolation, and Recovery
FDP	File Data Processing
FFRDC	Federally Funded Research and Development Center
FMEA	Failure Mode Effects Analysis
FMECA	Failure Mode Effects and Criticality Analysis
FPGA	Field Programmable Gate Array
FRACAS	Failure Reporting and Corrective Action System
FRR	Flight Readiness Review
FS	Flight System
FSW	Flight Software
FTA	Fault Tree Analysis
FTD	Fault Tolerant Design
FTE	Full-Time Equivalent
FTS	Frequency & Timing Subsystem

Acronym	Definition
G	General. Also, Class G software. G is a search tag used in this Software Engineering Handbook.
Gbps	Gigabyte per second
GCC	GNU Compiler Collection
GFE	Government Furnished Equipment
GIDEP	Government-Industry Data Exchange Program
GN&C	Guidance, Navigation, and Control
GNC	guidance, navigation, and control
GNU	GNU is a recursive acronym for 'GNU's Not Unix' It is a Unix-like computer operating system developed by the GNU Project, composed wholly of free software, is based on the GNU Hurd kernel and is intended to be a complete Unix-compatible software system.
GOTS	Government Off-the-Shelf Software - This refers to Government-created software, usually from another project. The software was not created by the current developers (see software reuse). Usually, source code is included and documentation, including test and analysis results, is available. That is, the government is responsible for the GOTS software to be incorporated into another system. (Definition from source document: NASA-GB-8719.13, NASA Software Safety Guidebook.) (Source: NPR 7150.2A - Appendix A)
GPS	Global Positioning System
GQIM	Goal/Question/Indicator/Metric (methodology).
GQM	Goal/Question/Metric (methodology).
GRC	Glenn Research Center
GS	Ground System
GSFC	Goddard Space Flight Center
GUI	Graphical User Interface
H	Class H software. H is a search tag used in this Software Engineering Handbook.
HDBK	Handbook
HLD	High Level Design
HQCE	NASA OCE. HQCE is also a search tag used in this Software Engineering Handbook to designate a subject relationship with NASA OCE.
HQSMA	NASA OSMA. HQSMA is also a search tag used in this Software Engineering Handbook to designate a subject relationship with NASA OSMA.
HW	Hardware
HWCI	Hardware Configuration Items

Acronym	Definition
I&T	Integration and Test
IA	Information Assurance or Independent Assessment.
IBA	IV&V Board of Advisors
IBD	IV&V Board of Directors
ICD	Interface Control Document
IDD	Interface Design Description
IDE	Integrated Development Environment
IEC	International Electrotechnical Commission
IEEE	Institute of Electrical and Electronics Engineers
IF	Intermediate Frequency or Inter-Facility Link
IMS	Integrated Master Schedule
IN	Integrated Network
INA	Integrated Network Architecture
INM	Integrated Network Management
INOC	Integrated Network Operations Center
IO	Input/Output
IOC	Initial Operational Capability
IP	Intellectual Property or Internet Protocol
IPAO	Independent Program Assessment Office
IPEP	IV&V Project Execution Plan
IPS	Institutional Programmatic Support
IR	Inheritance Review
IRD	Interface Requirements Document
ISD	Information Systems Division
ISE	Integrated Service Execution
ISO	International Standards Organization
ISS	International Space Station
ISSO	Information System Security Officer
IT	Information Technology
ITAR	International Traffic in Arms Regulations
IV&V	Independent Verification and Validation. Verification and validation performed by an organization that is technically, managerially, and financially independent of the development organization (ISO/IEC 24765:2008 systems and software engineering vocabulary). (Source: both NPR 7150.2A and NPR 7150.2B - Appendix A)
IVV	Also IV&V. See Independent Verification and Validation. See also VV. IVV is the tag used in this Software Engineering Handbook to indicate the IV&V Program as an organization have responsibility in regards to a requirement in 7150.2. IVV is also a search tag used in this Software Engineering Handbook to designate a subject relationship with IV&V.
IVVF	IV&V Facility
JPL	Jet Propulsion Laboratory
JSC	Johnson Space Center

Acronym	Definition
KDP	Key Decision Point. (NPR 7150.2A) Each phase of the NASA Program or Project life cycle is typically marked by a Key Decision Point (KDP), which usually is associated with a prescribed major design review. A KDP is an event wherein the decision authority determines the readiness of a program/project to progress to the next phase of the life cycle. See also gate. (NPR 7150.2B)
KSC	Kennedy Space Center
KSLOC	Thousands of Source Lines of Code
LAN	Local Area Network
LaRC	Langley Research Center
LCO	Link Control Operators
LIDAR	Light Detection and Ranging
LL	Lessons Learned. LL is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Lessons Learned.
LLD	Low Level Design
LLDP	Link Layer Data Processor
LOC	Lines of Code
LOE	Level of Effort
LPS	Launch Processing System
LRM	Low Rate Modem
LRU	Line Replacable Unit or Lowest Replacable Unit

Acronym	Definition
M&A	Measurement and Analysis. See also M-A.
M&S	Models and Simulations
M-A	Measurement and Analysis. M-A is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Measurement and Analysis. Also M&A.
MA	Multiple Access
MBDS	Model Based Development System
MCO	Mars Climate Orbiter
MCR	Mission Concept Review. MCR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Mission Concept Review.
MD	Each Mission Directorate. MD is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Mission Directorate.
MDBS	Model Based Development System
MDM	Metadata Manager
MDR	Mission Definition Review. MDR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Mission Definition Review.
MER	Mars Exploration Rover
MIB	Mishap Investigation Board
MICD	Mechanical Interface Control Drawing
MISRA C	MISRA C is a software development standard for the C programming language developed by MISRA (Motor Industry Software Reliability Association).
ML	Maturity Level
MO	Mars Observer
MOA	Memorandum of Agreement
MOC	Mission Operations Center
MoDAF	British Ministry of Defence Architecture Framework
MODEM	Modulator / demodulator
MOTS	Modified/Modifiable/Military off-the-shelf Software
MOU	Memorandum of Understanding
MPL	Mars Polar Lander
MRC	Monthly Recurring Cost(s)
MRR	Mission Readiness Review
MSFC	Marshall Space Flight Center
MSG	Management Steering Group
MSL	Mars Science Laboratory
MSR	Monthly Status Review
MSSC	Mission Software Steering Committee
MTBF	Mean Time Between Failures
MTTR	Mean Time to Repair
MUX	Multiplex
NARA	National Archives and Records Administration
NASA	National Aeronautics and Space Administration
NC&C	Network Asset Configuration & Control
NCS	Network Control System
NDIA	National Defense Industrial Association
NEN	NASA Engineering Network
NGN	NASA Ground Network
NHB	NASA Handbook
NISN	NASA Integrated Services Network
NIST	National Institute of Technology
NOC	Network Operations Center
NOCC	Network Operations Control Center
NODIS	NASA Online Directives Information System
NON	Network Operations Node
NPAS	Network Planning & Analysis System
NPD	NASA Policy Directive
NPR	NASA Procedural Requirement
NRC	Non-Recurring Cost(s)
NRT	Near Real-Time
NS	Network Scheduling
NSAP	Network Service Assurance Plan
NSC	Non-Safety Critical
NSEI	NASA Software Engineering Initiative
NSEII	NASA Software Engineering Initiative Implementation
NSEIIP	NASA Software Engineering Initiative Implementation Plan
NSR	Nominal Slow Rate
NTP	Network Time Protocol
NTR	Network Service Assurance Plan (NSAP) Technology Refresh

Acronym	Definition
O&M	Operations & Maintenance
OCE	Office of the Chief Engineer
OCIO	Office of the Chief Information Officer
ODIN	Outsourcing Desktop Initiative for NASA
OGOTS	Open Government Off the Shelf. An Open GOTS (OGOTS) project is a GOTS project which uses multiple-organization collaborative development approaches to develop and maintain software, in a manner similar to OSS. (Definition from: http://journal.thedacs.com/issue/56/175)
OMG	Object Management Group
OOD	Object Oriented Design
ORR	Operational Readiness Review. ORR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Operational Readiness Review.
OSI	Open Systems Interconnection
OSMA	Office of Safety and Mission Assurance
OSP	Orbital Space Plane
OSS	Open Source Software
OTS	Off the Shelf
P	Project
P Center	P ( C ) = P(Center) - Per approved Center defined process which meets a non-empty subset of the full requirement.
P(C)	P ( C ) = P(Center) - Per approved Center defined process which meets a non-empty subset of the full requirement.
P(C) SO	P(C) + SO = P (Center) + SO - Responsible party is required to meet this requirement to the extent necessary to satisfy safety critical aspects of the software and follow Center defined P (Center) processes for other aspects of the software.
PAL	Process Asset Library
PAR	Published Appraisal Results
PBMA	Process Based Mission Assurance
PBRA	Portfolio Based Risk Assessment
PC	Project Closeout. PC is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Project Closeout.
PCA	Physical Configuration Audit
PDF	Probability Distribution function
PDR	Preliminary Design Review. PDR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Preliminary Design Review.
PE	Process Engineering. PE is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Process Engineering.
PERT	Program Evaluation and Review Technique
PF	Project Formulation. PF is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Project Formulation.
PHA	Preliminary Hazard Analysis
PI	Project Implementation. PI is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Project Implementation.
Plan	Plan is a search tag used in this Software Engineering Handbook to designate a subject relationship with Plans. Not to be confused with the tag Acq_Plan (Acquisition Plan). See also Acq_Plan.
PLD	Programmable Logic Device.
PLOP	physical link operations procedure
PM	Project Manager. PM is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Project.
PM&C	Project Monitoring and Control. See also PM-C.
PM-C	Project Monitoring and Control. PM-C is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Project Monitoring and Control.
PMC	Process Monitoring and Control
PMSR	Preliminary Systems & Mission Review
POA&M	Plan of actions and milestones
POC	point of contact
PP	Project Planning. PP is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Project Planning.
PR	Product Release. PR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Product Release.
PRA	Probabilistic Risk Assessment
PRACA	Problem Report and Corrective Action
PRACAS	Problem Reporting and Corrective Action System
PROM	Persistent memory that cannot be modified.
PRR	Production Readiness Review. PRR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Production Readiness Review.
PSLA	Project Service Level Agreements

Acronym	Definition
QA	Quality Assurance
QPSK	quadrature phase-shift keying
RAF	Requirements Analysis Form
RASDS	Reference Architecture for Space Data Systems
RBA	Risk-Based Assessment
RFA	Request for Action
RFP	Request for Proposal
RID	Review Item Disposition.
RM-ODP	Reference Model of Open Distributed Processing
ROI	return on investment
ROM	Rough Order of Magnitude: An estimate of the resource required that is based on a person's experience and not on a summation of individual cost estimates.
RT	Real Time
RTOS	Real-Time Operating System
RTU	Remote Terminal Unit

Acronym	Definition
SA	NASA Chief Safety and Mission Assurance. Software Assurance. SA is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Software Assurance.
SA&R	Service Accountability and Reporting
SACR	Software Assurance Classification Report
SAFS	Standard Autonomous File Server
SAM	Supplier Agreement Management. Software Assurance Manager. SAM is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Software Assurance Manager.
SAN	Storage Area Network
SAP	Software Assurance Plan
SAR	System Acceptance Review. SAR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with System Acceptance Review.
SARP	Software Assurance Research Program
SATERN	System for Administration, Training and Educational Resources for NASA
SBU	Sensitive But Unclassified
SC	Safety Critical
SCAMPI	Standard CMMI Appraisal Method for Process Improvement
SCM	Software Configuration Management
SCMP	Software Configuration Management Plan
SCR	Software Change Request
SDD	Software Design Description/Document
SDLC	Software Development Life Cycle
SDP	Software Development Plan
SDR	System Definition Review. System Design Review. SDR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with System Design Review.
SDRAM	Synchronous Dynamic Random Access Memory.
SEB	Source Evaluation Board
SED	Software Engineering Division
SEI	Software Engineering Institute
SEIP	Software Engineering Initiative Plan
SEL	Software Engineering Laboratory
SEMP	Systems Engineering Management Plan
SEPG	Software Engineering Process Group
SGL	Space Ground Link
SIMS	Software Inventory Management System
SIR	System Integration Review. SIR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with System Integration Review.
SIS	Software Interface Specification
SLA	Service Level Agreement
SLOC	Source Lines of Code
SLWT	Super Light Weight Tank
SM	Supplier Monitoring. SM is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Supplier Monitoring.
SMA	Safety and Mission Assurance. Also S&MA. See also OSMA.
SMARTS	Safety and Mission Assurance Requirements Tracking System. SMARTS is from the NASA SMART program that Dr. John Lyver developed to pull requirements from standards and NPRs into one database for easy searching.
SMDP	Software Management and Development Plan
SME	Subject Matter Expert
SMP	Software Management Plan
SMR	Software Metrics Report
SMSR	Safety and Mission Success Review
SNE-E	Space Network Extension - East
SNMP	Simple Network Management Protocol
SO	SO - 'Safety Only' - Project is required to meet this requirement to the extent necessary to satisfy safety critical aspects of the software.
SOD	Supervisor On Duty
SOW	Statement of Work
SPAN	Software Process Across NASA
SPC	Shuttle Processing Contract
SpecTRM	Specification Tools and Requirements Methodology
SPWG	Space Protection Working Group
SQA	Software Quality Assurance
SQAP	Software Quality Assurance Plan
SRA	Software Release Authority. SRA is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Software Release Authority.
SRE	Software Requirements Engineer. SRE is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Software Requirements Engineer.
SRR	System Requirements Review. SRR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with System Requirements Review.
SRRA	Software Release Request Authorization
SRS	Software Requirement Specification
SSA	Source Selection Authority
SSAMP	Software Supplier Agreement Management Plan
SSC	Stennis Space Center
SSE	Software Systems Engineer. SSE is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Software Systems Engineer.
SSP	Software Safety Plan
STEP	SMA (Safety and Mission Assurance) Technical Excellence Program
STI	Scientific and Technical Information
STP	Software Test Plan
STPr	Software Test Procedure
STR	Software Test Report
STS	Shuttle Transportation System
STSC	Software Technology Support Center
SUM	Software User's Manual
SVD	Software Version Description
SVVP	Software Verification and Validation Plan
SW	Software
SWE	software engineering requirement
SWE 301	SWE 301 is the software engineering course for software fundamentals. It is described in the curricula found at the OCE software training site.
SWEET	Software Engineering Technical Excellence Training
SWEHB	Software Engineering Handbook.
SWG	Software Working Group
SwRR	Software Requirements Review
SysML	Systems Modelling Language
TA	Engineering Technical Authority for NPR 7150.2 by Requirement (see Note 3)
TBD	To Be Determined
TBR	To Be Resolved
TCP	Transmission Control Protocol
TDN	Temporal Dependence Network
TIM	Technical Interface Meeting
TM	technical manual or time management
TOGAF	The Open Group Architecture Forum
TPM	Technical Performance Measures
TRR	Test Readiness Review. TRR is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Test Readiness Review.
TS&R	Technical Scope and Rigor
TT&C	Tracking, Telemetry and Command

Acronym	Definition
UAT	User Acceptance Testing
UDP	User Datagram Protocol
UDTP	User Data Transfer Proxy
UIP	User Interface Proxy
ULR	Uplink Exciter & Ranging
UML	Unified Modeling Language
USA	United Space Alliance
USB	Universal Serial Bus
USG	User Service Gateway
V&V	Verification and Validation. See also V-V.
V-V	Verification and Validation. V-V is also a search tag used in this Software Engineering Handbook to designate a subject relationship with Verification and Validation.
VDD	Version Description Document
VPN	Virtual Private Network
VV	IV&V Program

Acronym	Definition
WAN	Wide Area Network
WBS	Work Breakdown Structure
WFF	Wallops Flight Facility
WSTF	White Sands Test Facility
WY	Work Year
WYE	Work Year Equivalent
X	X - 'Required' - Responsible party is required to meet the requirement as written.
X (SO if D-E)	X (SO if D-E) - Required for A-C, Required for D-E if SO ('Safety Only' - Project is required to meet this requirement to the extent necessary to satisfy safety critical aspects of the software.)
XMTR	Transmitter