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A collection of acronyms used extensively by the space flight program/projects.


A Ampere
A/D Analog to Digital
AA Associate Administrator
AAA Avionics Air Assembly
ABRS Advanced Biological Research System
AC Alternating Current
ACE Advanced Colloids Experiment
ACME Advanced Combustion Microgravity Experiment
ACS Atmospheric Control and Supply
ACUC Animal Care and Use Committee
ACWP Actual Cost of Work Performed
ADAS Ambulatory Data Acquisition System
ADM Acquisition Decision Memorandum
ADP Acceptance Data Package
AEE Advanced Engineering Environment
AEMC Advanced Environmental Monitoring and Control, GFM-2
AEON Advanced Engineering Operations Network Portal
AER Advanced Exploration Research
AES Anthropometric EVA Suit
AEVA Advanced Extra Vehicular Activity
AFC Auxiliary Fluids Container
AFT Advanced Food Technology
AHLS Advanced Human Life Support
AIM Advanced Integrated Matrix
AL Air Lock
ALI Alice-Like Insert
ALP Advanced Liquid Pumps
ALS Advanced Life Support
AO Announcement of Opportunity
AoA Analysis of Alternatives
AOA Annual Operating Agreement
AOS Acquisition of Signal
AP Acceleration Projects
APB Accounting Principles Board
APB Acquisition Program Baseline
APCP Automated Procedure Control Panel
APG Annual Performance Goal
API Application Programming Interface
APID Application Process Identifier
APMC Agency Program Management Council
APOM Assistant Payload Operations Manager
APPL Academy of Program and Project Leadership
APS Automated Payload Switch
APSSP Advanced Propulsion Systems and Space Power
APV Automated Procedure Viewer
AR Anomaly Report
AR Air Revitalization
ARC Ames Research Center
ARD Aeronautics Research Mission Directorate
ARED Advanced Resistive Exercise Device
ARIS Active Rack Isolation System
ARIS Active Rack Isolation Unit
ARIS-ICE Aris-Iss Characterization Experiment
ARM Active Risk Manager
ARMD Aeronautics Research Mission Directorate
ARR Assemble, Test, and Launch Operations (ATLO) Readiness Review
ARS Air Revitalization System
AS Ascent Stage
AS Acquisition Strategy
ASBCA Armed Services Board of Contract Appeals
ASCB Avionics Software Control Board
ASCII American Standard Code for Information Interchange
ASI Agency Safety Initiative
ASIC Application-Specific Integrated Circuit
ATCS Air Thermal Control System
ATCU Air Thermal Control Unit
ATD Advanced Technology Development
ATHINA Investigation of Diffusion Flame Tip Thermo-diffusive and Hydrodynamic Instability Under Microgravity Conditions
ATP Authority to Proceed
ATP Acceptance Test Plan
AUID Agency Issued ID
AWG American Wire Gauge


BAA Broad Area Announcement
BAC Budget at Completion
BAD Broadcast Ancillary Data
BASS Burning and Suppression Of Solids
BCAT Binary Colloidal Alloy Test
BCAT-3 Binary Colloidal Alloy Test – 3
BCAT-4 Binary Colloidal Alloy Test – 4
BCAT-5 Binary Colloidal Alloy Test – 5
BCAT-C1 Binary Colloidal Alloy Test CSA Payload-1
BCDCE Bi-Component Droplet Combustion Experiment
BCOEL Boiling Heat Transfer & Control of Bubble Motion in Microgravity using Electric Fields
BCPR Bioastronautics Critical Path Roadmap
BCWP Budgeted Cost for Work Performed
BDiSL Buoyancy Driven Instabilities in Single Bubble Sonoluminescence
BH Big Habitat
BIO Biological
BMP Biomass Production
BOE Basis-of-Estimate
BPRAC Biological and Physical Research Advisory Committee
BPRR Biological and Physical Research Rack
BRE Burning Rate Emulator
BVX Bulk Viscosity of Xenon
BXF Boiling Experiment Facility
BY Budget Year


C&C Command and Control
C&DH Command and Data Handling
C&T Communications and Telemetry
C&T Communications and Tracking
C&W Caution and Warning
C4ISP Command, Control, Communications, Computers and Information Systems Protection
CAD Cost Analysis Division
CAD Computer Aided Design
CADRe Cost Analysis Data Requirement
CAI Communications, Avionics, and Informatics
CAIB Columbia Accident Investigation Board
CAIG Cost Analysis Improvement Group
CAIV Cost as an Independent Variable
CAN Controller Area Network
CANSEI Control and Network Systems, Electrical power, and ICS communication officer
CATS Cloud-Aerosol Transport SysteM
CARD Cost Analysis Requirements Document
CBE Current Best Estimate
CBT Computer Based Training
CCA Clinger-Cohen Act
CCB Configuration Control Board
CCBD Configuration Control Board Directive
CCD Charge-Coupled Device
CCF The Cleveland Clinic Foundation
CCF Critical Velocities in Open Capillary Channels
CCIAM Color Camera Image Acquisition Module
CCSDS Consultative Committee for Space Data Systems
CCR Central Contractor Registry
CCRM Continuous Cost Risk Management
CCU Confocal Control Unit
CDD Capability Development Document
CDMS Command and Data Management System
CDOT Colloidal Disorder-Order Transitions Experiment
CDR Critical Design Review
CDRA Carbon Dioxide Removal Assembly
CDRL Contrac Data Requirements List
CDS Central Data System
CDS Cargo Delivery System
CE&R Concept Exploration and Refinement
CECE Common Extensible Cryogenic Engine
CERR Critical Events Readiness Review
CEV Crew Exploration Vehicle
CEVIS Cycle Ergometer with Vibration Isolation and Stabilization
CEVLS Crew Exploration Vehicle Launch Segment
CFE Capillary Flow Experiment
CFM Cubic Feet per Minute
CFM-2 Candle Flames in Microgravity-2
CFO Chief Financial Officer
CG Center of Gravity
CGBA Commercial Generic Bioprocessing Apparatus
CGSE Common Gas Supply Equipment
CHAINS CHain Aggregation INvestigation by Scattering
CHESS Condensing Heat Exchanger for Space Systems
CI Counter-Intelligence
CIA Chamber Insert Assembly
CIBS Coalescence Inhibition of Bubbly Suspensions Experiment
CIO Chief Information Office
CIR Combustion Integrated Rack
CL Contact Line
Clean-Flame Field Effects of Gravity on Lean Premixed Turbulent Flames
CLiDE Contact Line Dynamics Experiment
CLV Crew Launch Vehicle
CM Configuration Management
CM-2 Combustion Module – 2
CMT Critical Mission Task
CNC Condensation Nuclei Counter
COFC Court of Federal Claims
CoFR Certification of Flight Readiness
COLLIDE-2 Collisions into Dust Experiment – 2
Con Ops Concept of Operations
COTR Contracting Officer Technical Representative
COTS Commercial-Off-the-Shelf
CPAF Cost Plus Award Fee
CPCI Compact-Peripheral Component Interconnect
CPAF/IF Cost Plus Award Fee / Incentive Fee
CPD Capability Production Document
CPFF Cost Plus Fixed Fee
CPM Critical Path Method
CPU Central Processor Unit
CR Change Request
CRA Continuing Resolution Authority
CRL Countermeasure Readiness Levels
CRM Continuous Risk Management
CRR Crew Readiness Review
CRT Contingency Response Technologies
CRWT Containerless Ripple Wave Turbulence Experiment
CSA Canadian Space Agency
CSD Comparative Soot Diagnostics
CSD Computer Services Division
CSFM Cold Stowage Fleet Manager
CSI CGBA Science Insert
CSLM Coarsening in Solid-Liquid Mixtures
CSLM-2 Coarsening of Solid-Liquid Mixtures-2
CSM Center for Space Medicine
CSMT Cold Stowage Management Team
CTB Cargo Transport Bag
CTC Crew Training Coordinator
CTO Chief Training Officer
CV Cost Variance
CVB Constrained Vapor bubble
CVIT Common Video Interface Transmitter
CVIU Common Video Interface Unit
CVX-2 Critical Viscosity of Xenon-2
CY Calendar Year


DA Digital Astronaut
DAA Deputy Associate Administrator
DAD Decision Action Diagram
DAFT Dust and Aerosol measurement Feasibility Test
DAR Defense Acquisition Regulation
DAU Defense Acquisition University
DC Direct Current
DCAM Dynamic Contact Angle Measurement Experiment
DCE Droplet Combustion Experiment
DCE-2 Droplet Combustion Experiment-2
DCM Diagnostic Control Module
DCMA Defense Contract Management Agency
DCR Design Concept Review
DCS Digital Camera System
DDCE Dynamics of Droplet Combustion and Extinction Experiment
DECLIC DEvice for the study of Critical LIquids and Crystallization
DFP Data Flow Plan
DFRC Dryden Flight Research Center
DID Deliverable Item Document
DIMS Digital Imagery Management System
DISC Digital Imaging Star Camera
dlm Downlink Manager
DLS Daily Load Stimulus
DMB Data Management Board
DMC Data Management Coordinator (MSFC POIC Duty Position)
DMO Command and Data Management Officer (GRC FCF Duty Position)
DMS Data Management System
DO Delivery Order
DoD U.S. Department of Defense
DOP Daily Operations Plan
DoS U.S. Department of State
DOT Department of Transportation
DP Delivery Plan
DPC Daily Planning Conference
DPIV Digital Particle Imaging Velocimetry
DRD Data Requirement Delivery
DRD Data Requirements Document
DRFP Draft Request for Proposal
DRM Design Reference Mission
DS Descent Stage
DSN Deep Space Network
DSO Detailed Science Objective
DSP Digital Signal Processor
DSRC Data System Routing and Configuration
DSS Destination Surface Stage
DT-IAM Diagnostic Technologies – Integrated Autonomous Medicine
DVD Digital Video Disk


EA Evolutionary Acquisition
EAC Estimate at Completion
EAR Export Administration Regulations
EC Embedded Controller
ECL Exercise Countermeasures Laboratory
ECLSS Environmental Control and Life Support System
ECO Engineering Change Order
ECP Export Control Program
ECP Exercise Countermeasures Project
ECR Engineering Change Request
ECS Environmental Control System
ECU Electronics Control Unit
ECU Environmental Control Unit
ECW Emergency, Caution and Warning
EDCA Entropically Driven Colloidal Assembly Experiment
EDL Entry Descent and Landing
EDMS Electronic Document Management System
EDR European Drawer Rack
EDS Enhanced Data System
EDS Earth Departure Stage
EE Electronics Enclosure
EEU Environmental Electronics Unit
EGM Electrostatics of Granular Materials Experiment
EGSE Experiment Ground Support Equipment
EHR Exploration Human Research
EHS Enhanced HOSC System
EI Entry Interface
EIA Electronic Industries Association
EIRD Exploration Investigation Requirements Document
ELC EXPRESS Laptop Computer
ELM Enhanced Light Microscope
ELV Expendable Launch Vehicle
EM Engineering Model
EMCS Enhanced Mission Communications System
EMI Electromagnetic Interference
EMO Environmental Management Office
EMS Environmental Management System
EMS Experiment Mounting Structure
EO Earth Orbit
EPCU Electrical Power Control Unit
EPS Electrical Power System
ER# EXPRESS Rack number
ERB Engineering Review Board
ERD Engineering Requirements Document
ERE Extensional Rheology Experiment
ES Earth Surface
ESA European Space Agency
ESC Electronic Still Camera
ESC Evaporative Spray Cooling
ESD Exploration Systems Division
ESM Equivalent System Mass
ESMD Exploration Systems Mission Directorate
ESMD PARL ESMD Performance Assessment Report Lead
ESMD PPL ESMD Performance Planning Lead
ESMD SAMP ESMD Single Acquisition Management Plan
ESMD SEMP ESMD Theme Systems Engineering Management Plan
ESN External Services Network
ESR&T Exploration Systems Research & Technology Division
ESS Exploration System of Systems
ESSA EPCU Shutoff Switch Assembly
ETC Estimate to Completion
ETM Equipment Transfer Module
ETO Earth-to-Orbit
ETOV Earth-to-Orbit Vehicle
EV Earned Value
EV Entry Vehicle
EVA Extra Vehicular Activity
EVM Earned Value Management
EVMS Earned Value Management System
EVP Exhaust Vent Package
EWCA Emergency, Warning, Caution, and Advisory
EXMC Exploration Medical Capability and Digital Astronaut
EXPRESS Expedite the Process of Experiments to the Space Station Rack
eZLS Enhanced Zero-g Locomotion Simulator


FAD Formulation Authorization Document
FAM Familiarization (training)
FAR Federal Acquisition Regulations
FCA Functional Configuration Audit
FCF Fluids and Combustion Facility
FDS Functional Discipline Specialist
FEANICS Flow Enclosure Accommodating Novel Investigations in Combustion of Solids
FFP Firm Fixed Price
FFRDC Federally Funded Research and Development Center
FHA Flight Hardware Availability
FICS FOMA Instrumentation Calibration System
FIR Fluids Integrated Rack
FIST Flammability Diagrams of Combustible Materials in Microgravity
FLEX FLame Extinguishment eXperiment
Flt Platform Flight 4.1.2
FM Functional Model
FMEA/CIL Failure Mode Effects Analysis / Critical Item List
FMS Food Management System
FO Forward Osmosis
FOAM Foam Optics and Mechanics Experiment
FOC Full Operational Capability
FOIA Freedom of Information Act
FOM Figure-of-Merit
FOMA Fuel Oxidizer Management Assembly
FOOT Lower Extremity Monitoring Suit ISS Experiment
FPAF Fixed Price Award Fee
FPC Food Preparation Capabilities
FPDS Fire Prevention, Detection, and Suppression
FPI Fixed Price Incentive
FPSR Fluid Physics Strategic Research
FRR Flight Readiness Review
FSAP Fluid Science Avionics Package
FSDP Flight Safety Data Packages
FSL Fluid Science Laboratory (ESA)
FSR Flight safety Review
FU Flight Unit
FunRes Fundamental Research
FY Fiscal Year


G&A General and Administrative
GAO General Accounting Office
GC Gas Chromatograph
GCR Galactic Cosmic Ray
GEL Gravity Effects in Lyophilization
GERT Graphical Evaluation Review Technique
GESS GRC Engineering and Scientific Support
GFE Government Furnished Equipment
GFM Granular Flow Module
GGM Gravity and Granular Materials, GFM-3
GIU Ground Interface Unit
GMSF Growth and Morphology of Supercritical Fluids Experiment
GN&C Guidance, Navigation and Control
GOTS Government-Off-The-Shelf
GPD Gate Product Deliverable
GPMC Governing Program Management Council
GPRA Government Performance and Results Act
GRADFLEX Gradient Driven Fluctuations Experiment
GRC Glenn Research Center
GSDP Ground Safety Data Package
GSE Ground Support Equipment
GSP Ground Support Personnel
GSS Ground Support System
GTP Gas Tolerant Pump
GLIDE Global Integrated Design Environment


HBCU Historically Black Colleges and Universities
HCA Head of Contracting Activity
HCL Human Capitol Liaison
HCR Hardware Concept Review
HFIT Human Factor Integration Test
HIPPA Hip Investigator for Protecting Astronaut Anatomy
HQ Headquarters
HRIS Human Resources Information System
HSR&T Human Support Research Technology
HUB Historically Underutilized Business


IA Independent Assessment
IAO International Announcement of Opportunity
IBPD Integrated Budget and Performance Document
IBR Integrated Baseline Reviews
ICA Independent Cost Assessment
ICAT Independent Cost Assessment Team
ICD Interface Control Document
ICE Independent Cost Estimate
ICE Interface Configuration Experiment
ICP Intramural Call for Proposal
ICR Initial Confirmation Review
ICR Investigation Continuation Review
ID Incremental Development
IDD Interface Definition Document
IEEE/EIA Institute of Electrical and Electronics Engineers / Electronic Industries Association
IFB Invitation for Bid
IGA Inter-Governmental Agreement
IGCE IIndependent Government Cost Estimate
ILS Integrated Logistics Support
IMS Integrated Master Schedule
InSPACE Investigating the Structure of Paramagnetic Aggregates from Colloidal
InSPACE-2 Investigating the Structure of Paramagnetic Aggregates from Colloidal – 2
INSTEP In-Space Technology Experiments Program
IOC Initial Operational Capability
IOP Input Output Package
IPA Independent Program Assessment
IPAO Independent Program Assessment Office
IPAT Independent Program Assessment Team
IPO Institutional Program Office
IPP Innovative Partnerships Program
IPS Integrated Program Summary
IPSU Image Processing & Storage Unit
IPT Integrated Product Team
IR Infared
IRB Internal Reference Base
IRD Interface Requirements Document
iRED Interim Resistive Exercise Device
IRR Interim Research Review
IS3 In-Space Support System
ISFR In-Situ Fabrication and Repair
ISLSP In-Situ Life Support Processes
ISO International Organization for Standardization
ISRU In-Situ Resource Utilization
ISS International Space Station
IT Information Technology
ITA Independent Technical Authority
ITAR International Traffic in Arms Regulations
IVA Intravehicular Activity
IVGEN Intra Venous Water GENeration
IV&V Independent Verification and Validation


JAXA Japanese Aerospace Exploration Administration
JIMO Jupiter Icy Moon Orbiter
JIT Joint Integration Test
JPL Jet Propulsion Lab
JSC Johnson Space Center


KA Key Activities
KDP Key Decision Point
KPP Key Performance Parameters
KSC Kennedy Space Center


LaRC LaRC Langley Research Center
LAWG LAWG Lunar Architecture Working Group
LCC LCC Life Cycle Cost
L/D L/D Lift/Drag coefficient
LED LED Light Emitting Diode
LEO LEO Low Earth Orbit
LEPAG LEPAG Lunar Exploration Program Working Group
LExSWG LExSWG Lunar Exploration Science Working Group
LFCA LFCA Low Volume Fraction Colloidal Assemblies Experiment, LMM-4
LF-X LF-X Logistics Flight
LH2 LH2 Liquid Hydrogen
LIS LIS Lead Increment Scientist
LFCA LFCA Low Volume Fraction Colloidal Assemblies Experiment, LMM-4
LLO LLO Low-Lunar Orbit
LME LME Liquid Management Experiment
LMM LMM Light Microscopy Module
LMS LMS Lunar Mission Scenario
LO LO Lunar Orbit
LOA LOA Letter of Agreement
LOC LOC Lunar Orbit Capture
LOE LOE Level of Effort
LOM LOM Loss of Mission
LOX LOX Liquid OXygen
LRIP LRIP Low-Rate Initial Production
LRL LRL Lunar Robotic Lander
LRO LRO Lunar Robotic Orbiter
LRR LRR Launch Readiness Review
LS LS Lunar Surface
LSAM LSAM Lunar Surface Access Module
LSH LSH Life Support and Habitation
LSI LSI Landed Surface Interrogator
LSP LSP Laminar Soot Process
LSPG LSPG Life Support Power Generation System
L1 Libration point 1 (Earth-Moon)


M&S Modeling and Simulation
MABE Microheater Array Boiling Experiment
MAMS Microgravity Acceleration Measurement System
MCDL Master Controlled Documents List
MDA Milestone Decision Authority
MDCA Multi-user Droplet Combustion Apparatus
MDCA Mission System Development Implementation Plan
MEL Microgravity Environment Lab
MEPAG Mars Exploration Program Analysis Group
MFS Multiphase Flow Separators
MFT Multiphase Flow Technology
MGFA Multi-user Gaseous Fuels Apparatus
MGI MICROSCALE Glovebox Investigation Experiment
MGM-III Mechanics of Granular Materials Experiment – III
MI Minority Institutions
MIDAS Miscible Interface Dynamics and Simulation Experiment
MIST Water Mist Fire Suppression Experiment
MIUL Material Identification Usage List
MMA Microgravity Measurement Apparatus
MMOD Micro-Meteoroid and Orbital Debris
MOA Memorandum of Agreement
MOBI Microgravity Observations of Bubble Interaction Experiment
MOMM Microscopy and Optical Manipulation Module
MOP Mission Operations Plan
MOTS Modified-Off-The-Shelf
MOU Memorandum of Understanding
MRDOC Microgravity Research, Development and Operations Contract
MRR Mission Readiness Review
MS Milestone
MSCRE Microgravity Smoldering Combustion Re-Flight Experiment
MSD Microgravity Science Division
MSD Mission System Development
MSFC Marshall Space Flight Center
MSG Microgravity Science Glovebox
MST Mission Sequence Test
MWA Maintenance Work Area
μMRF Micromechanics of Magnetorheological Fluids, LMM-5
μgSEG Particle Segregation in Collisional Sheering Flows Experiment, GFM-1
μSCALE Microscale Hydrodynamics Near Moving Contact Lines Experiment
μSiGMA Micro Solids Interacting with Gas in a Microgravity Apparatus Experiment, GFM-2


N/A Not Applicable
NAC NASA Advisory Committee
NAR Non-Advocate Review
NASA National Aeronautics and Space Administration
NBX Nucleate Boiling Experiment
NCMR National Center for Microgravity Research (see NCSER)
NCRP National Council on Radiation Protection
NCSER National Center for Space Exploration Research (formerly NCMR)
NDI Non-Developmental Items
NEDD Natural Environments Definition for Design
NEP Nuclear Electric Propulsion
NEPA National Environmental Policy Act
NESC NASA Engineering and Safety Center
NFS NASA FAR Supplement
NGIT Northrop Grumman, Information Technologies (MRDOC)
NIST National Institute of Standards & Technology
NLSA Nuclear Launch Safety Approval
NODIS NASA Online Directives Information System
NP NASA Publication
NPBX Nucleate Pool Boiling under Microgravity Experiment
NPD NASA Policy Directive
NPD NASA Policy Documents
NPR NASA Procedural Requirement (Document)
NRA NASA Research Announcement
NRC National Research Council
NSRS NASA Safety Reporting System
NSSA National Security Space Acquisition
NSSA Nuclear Technology and Demonstrations
NTR Nuclear Thermal Rocket
NWR Not Worth Reporting


OAG OAG Operations Advisory Group
OASIS OASIS Observation and Analysis of Smetic Islands in Space, LMM-7
OCE OCE Office of the Chief Engineer
OCHMO OCHMO Office of the Chief Health and Medical Officer
OCR OCR Operations Change Request
OG OG Over guide-line
OM OM Orbital Module
OMB OMB Office of Management and Budget
ORDT ORDT Objectives and Requirements Definition Team
ORR ORR Operations Readiness Review
ORU ORU Orbital Replacement Unit
OSD OSD Office of the Secretary of Defense
OSMA OSMA Office of Safety and Mission Assurance
OSP OSP Orbital Space Plane
OV OV Operational View
OZ NASA JSC ISS Payload Integration Office


PA&E Program Analysis and Evaluation
PAH Payload Accomodations Handbook
PAP Product Assurance Plan
PAPAC Provide Aerospace Products and Capabilities
PAR Performance and Accountability Report
PaRIS Passive Pack Isolation System
PARL Performance and Accountability Reporting Lead
PARS Payload Anomoly Report System
PART Program Assessment Rating Tool
PAS Passive and Active Gas-Liquid Separator Devices
PASEP Passive and Active Phase Separators
PASLB Passive Acoustic Stabilization of Liquid Bridges Experiment
PBM-1 Pool Boiling Module-1
PBMA Process Based Mission Assurance
PBRE Packed Bed Reactor Experiment
PBS President’s Budget Submission
PBS Product Breakdown Structure
PC PCA Plane Change Program Commitment Agreement
PCAD Propulsion and Cryogenic Advanced Development
PCB Program / Project Control Board
PCE Particulate Control Experiment
PCS Physics of Colloids in Space Experiment, LMM-3
PCS+ Physics of Colloids in Space Experiment Plus
PCS-2 Physics of Colloids in Space Experiment-2
PCS-3 Physics of Colloids in Space-3
PD Payload Developer
PDE Pulsed Thermal Loop Demo
PDL Payload Data Library
PDR Preliminary Design Review
PDS Planetary Data System
PERT Program Evaluation Review Technique
PESHE Programmatic Environmental, Safety, and Occupational Health Evaluation
PHaSE-2 Photo-Flight Model
OASIS Physics of Hard Spheres Experiment-2, LMM-2
PI Principal Investigator
PIA Payload Integration Agreement
PIDS Principal Investigator Data Service
PIM Payload Integration Manager
PIMS Principal Investigator Microgravity Services
PIRN Preliminary Interface Revision Notice
PKE Plasma Krystal Experiment
PLAR Post-Launch Assessment Review
PMA President’s Management Agenda
PMB Performance Measurement Baseline
PMC Program management Council
PMDP Project Management Development Process
PMF Propellant Mass Fraction
PMIT Program Manger’s Handbook
PMIT Payload Mission Integration Team
PNAR Preliminary Non-Advocate Review
POC Point of Contact
POIC Payload Operations & Integration Center
POIWG Payload Operations & Integration Working Group
POP Program Operating Plan
PP-SLD Passive Pneumatic Subject Load Device
PPL Performance Planning Lead
PRACA Preventive and Corrective Action
PRA Probabilistic Risk Assessments
PRD Program Requirements Document
P-SLD Pneumatic Subject Load Device
PSR Pre-Ship Review
PSRP Payload Safety Review Panel
PSTR Pre-Storage Review
PStR Pre-Storage Review
PTDR Payload Training Dry Run
PTR Payload Technical Review
PV Process Verification
PWP Primary Water Processor
PY Program Year


QA QA Quality Assurance
QFD QFD Quality Function Deployment


R&T Research and Technology
R&TD Research and Technology Development
RCAR Requirements Change Assessment Report
RCR Research Concept Review
RDR Requirements Definition Review
RED Resistive Exercise Device
REEFS Radiative Enhancement Effects on Flame Spread
RFA Request for Action
RFI Request for Information
RFP Request for Proposal
RFQ Request for Quote
RGF,GFM-4 Regimes of Granular Flow
RID Review Item Discrepancy
RLEP Robotic Lunar Exploration Program
RMB Risk Management Board
RMSAG Risk and Mission Success Advisory Group
RP-1 Rocket Propellant 1
RPS Robotic Precursor System
RPWG Research Payload Working Group
RTIP Research and Technology Implementation Plan
RTM Research Team Member
RTS Remote Triaxial Sensor
RTSAD Risk Tool Suite for Advanced Design
RWGS Reverse Water Gas Shift


S&MA Safety and Mission Assurance
S/C Spacecraft
SAME Smoke Aerosol Measurement Experiment
SAMP Single Acquisition Management Plan
SAPIAD Space Science Pending International Agreement Database
SAMS Space Acceleration Measurement System
SAR Shared Accommodations Rack
SARG Standard Assurance Requirements and Guidelines
SBA Simulation Based Acquisition
SBIR Small Business Innovative Research
SCMP Soft Condensed Matter Physics
SCR Science Concept Review
SCWO Super Critical Water Oxidation
SDL  Structural Dynamics Laboratory
SDP Safety Data Package
SDR System Design Review
STDO Station Development Test Objective
SDTO Science Detailed Test Objective
SDVOSB Service Disabled Veteran Owned Small Businesses
SE Systems Engineer
SE&I Systems Engineering and Integration
SEB Source Evaluation Board
SEDC Sooting and Radiation Effects in Droplet Combustion Experiment
SEMP Systems Engineering Management Plan
SEP Gas-liquid Separator Experiment
SEP Liquid-Gas Separator Experiment
SEP Solar Proton Event
SESCDP Senior Executive Service Candidate Development Program
S-FLAME Structure and Response of Spherical Diffusion Flames
SHERE Shear History Extensional Rheology Experiment
SIBAL Solid Inflammability Boundary at Low-Speed
SICD Spiral Initial Capabilities Document
SiGMA Gas-Particle Interactions in a Microgravity Flow Cell
SLB Stabilization of Liquid Bridges
SLD Subject Load Device
SMA Safety and Mission Assurance
SMARR Safety and Mission Assurance Readiness Review
SMARTS Safety and Mission Assurance Requirements Tracking System
SMD Science Mission Directorate
SMO System Management Office
SMOKE Characterization of Smoke Particulate for Spacecraft Fire Detection
SOFBALL Structure of Flame Balls at Low Lewis-numbers
SOLAR Site for Online Learning and Resources
SOMD Space Operations Mission Directorate
SOW Statement of Work
SPAWG Space Communications Analysis Working Group
SPE Solar Particle Event
SPICE Smoke Points in Co-flow Experiment
SPU Sample Processing Unit
SRD Systems Requirements Documents
SRFE Smart Fluid Rheology
SRM&QA Safety, Reliability, Maintainability and Quality Assurance
SRR System Requirements Review
SS Systems-of-Systems
SSAA System Security Authorization Agreement
SSAS Space System Acquisition Strategy
SSC Stennis Space Center
SSPIAD Space Science Pending International Agreements Database
SSTAC Space Science and Technology Advisory Committee
STD Standard (Document)
STES Single-locker Thermal Enclosure System
STTP Strategy to Task to Technology Process (or Panel)
STTR Small Business Technology Transfer
SV Schedule Variance
SV System View
SVTL Safety Verification Tracking Log
SWMS Solid Waste Management System
sZLS Standalone Zero-g Locomotion Simulator


T&E Test & Evaluation
T Tank (NTR staging tank)
T2 Second ISS Treadmill
TBD To Be Decided
TBD To Be Determined
TBR To Be Resolved
TC Thermal Control
TCPI To Complete Performance Index
TDRSS Tracking and Data Relay Satellite System
TEI Trans-Earth Injection
TEM Transmission Electron Microscope
TEMP Test and Evaluation Management Plan
TEMP Test and Evaluation Master Plan
TIGER-3D Transition from Ignition to Flame Growth under External Radiation in Three Dimensions
TIM Technical Interchange Meetings
TLI Trans-Lunar Injection
TΦFFy Two-Phase Flow Facility
TO Trade Option
TOC Total Ownership Cost
TPFE Two-Phase Flow Experiment
TPHT Two-Phase Heat Transfer
TPM Technical Performance Measurement
TPM ALS Two-Phase Modeling
TPS Thermal Protection System
TRL Technology Readiness Level
TRP Transition Research Projects
TS Thermal Systems
TSC TeleScience Center
TSH-ES Triaxial Sensor Head-Ethernet Standalone
TV Technical View
TVIS Treadmill with Vibration Isolation and Stabilization
TVR Test and Verification Review
TWH Technical Warrant Holders


UF-X Utility/Utilization Flight
ULF UtiLization Flight
UML Universal Mounting Location
UMMC University of Mississippi Medical Center
UPN Unique Project Number
URL Uniform Resource Locator
UTMB University of Texas Medical Branch
UVIS Ultraviolet-Visible-Infrared Spectrophotometer


VAR VAR Variance Analysis Report
VCD VCD Vapor Compression Distillation
VE VE Value Engineering
VLA VLA Vehicle Loads Analysis
VOSB VOSB Veteran-Owned Small Business
VPCAR VPCAR Vapor Phase Catalytic Ammonia Reactor
VPERD VPERD Verification Plan and Engineering Requirements Document
VRR VRR Verification Readiness Review
VTL VTL Verification Tracking Log


WBS Work Breakdown Structure
WCD Workforce Competency Dictionary
WFCA Water Flow Control Assembly
WFI Water for Injection
WONDER Water Offset Nutrient Delivery Experiment
WOSB Woman Owned Small Businesses
WP Water Processor
WR Water Reclamation
WRS Water Recovery System






ZBOT ZBOT Zero Boil-Off Tank Project
ZBR ZBR Zero Base Review
ZGF ZGF Zero Gravity Facility
ZIN ZIN ZIN Technologies
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