| Subject | English | Thesaurus |
| mil., abbr. | Acquisition Systems Protection Program | ASPP |
| abbr., scottish | Advanced Deployable Systems program | ADS (US Navy) |
| abbr., astronaut. | Advanced Research in Telecommunications Systems ESA Programme | ARTES |
| abbr., astronaut. | Advanced Systems and Technology Programme | ASTP (ESA) |
| energ.ind., abbr. | Advanced Turbine Systems Program | ATSP |
| USA | Aircraft Certification Systems Evaluation Program | ACSEP |
| abbr., scottish | Armored Systems Modernization program | ASM (US Army) |
| mil., abbr. | Army Data Services and Administration Systems Command | ADSC |
| abbr., scottish | Artillery Systems Research Programme | ASRP |
| st.exch., abbr. | BEA Systems, Inc. options | VZP |
| st.exch., abbr. | Cabletron Systems, Inc. options | VIW |
| mil., abbr. | Close Combat Light Systems Program Review | CCLSPR |
| ocean., abbr. | Coastal Ocean Prediction Systems Program | COPS |
| abbr., file.ext. | Cooperative Library Agency for Systems and Services | CLASS |
| abbr., scottish | Countermeasures And Weapon Systems Engagement Model programme | CAWSEM (UK) |
| abbr., scottish | Crisis Response Operations in NATO Open Systems programme | CRONOS |
| IT, abbr. | Dedicated Office Systems and Services | DOSS |
| el., abbr. | Defence Systems Application Program | DSAP |
| USA | Defense Information Systems Network - Leading Edge Services | DISN-LES |
| mil., abbr. | Defense Information Systems Security Program | DISSP |
| mil., abbr. | Defense Information Systems Technical Service Program | DISTSP |
| mil., abbr. | Defense Satellite Communications Systems Application Program | DSAP |
| abbr., scottish | Defense-wide Information Systems Security Program | DISSP (USA) |
| abbr., mil., WMD | Deputy Director Acquisition Policy and Program Integration for Acquisition Systems Management, Office of the Under Secretary of Defense for Acquisition | Dep Dir, ASM |
| mil., abbr. | Direct Reporting Program Manager for Strategic Systems Programs | DRPM SSP |
| USA | Directorate Of Information Systems And Services | DISS |
| energ.ind., abbr. | Distributed Generation Systems Program | DGSP |
| abbr. | Formal Verification Systems Evaluation Program | FVSEP (Vosoni) |
| abbr., scottish | GTE International Systems Co. | GTEISC (USA) |
| abbr. | Information Systems and Services | ISS (информационные системы и услуги Oleg Sollogub) |
| abbr. | Information Systems and Services | IS&S (информационные системы и услуги Oleg Sollogub) |
| abbr., commun. | Information Systems / Integrated Services | IS |
| mil., abbr. | Information Systems Quality Program | ISQP |
| IT, abbr. | Integrated Systems and Information Services | ISIS (OS, Intel) |
| abbr., file.ext. | Integrated Systems and Information Services | ISIS |
| abbr., file.ext. | Interactive Continuous Systems Modeling Program | ICSMP |
| abbr., scottish | Land Operations Command Systems programme | LOCS (British Army) |
| abbr., scottish | Lockheed Aeronautical Systems Co. | LASC (USA) |
| abbr., scottish | McDonnell Douglas Missile Systems Co. | MDMSC (USA) |
| abbr., scottish | McDonnell Douglas Space Systems Co. | MDSSC (USA) |
| abbr., file.ext. | Medical Information Systems Program | MISP |
| st.exch., abbr. | Mercury Computer Systems options | QYR |
| abbr. | North American Automated Systems co. | NAAS |
| st.exch., abbr. | Objective Systems Integrator options | UQJ |
| st.exch., abbr. | OSI Systems, Inc. Options | UOJ |
| busin., abbr. | Qualified Information Systems Vendors program | QISV |
| abbr., scottish | Re-entry Systems Launch Program | RSLP (USA) |
| abbr., scottish | Sensor Technology for Affordable IR Systems programme | STAIRS (UK) |
| mil., abbr. | Services Systems Acquisition Review Council | SSARC |
| abbr., astronaut., mil. | Strategic Systems Programs | SSP |
| abbr., scottish | Systems Acquisition Support Services | SASS |
| abbr., comp., net. | Systems Network Architecture Distributed Services | SNADS |
| abbr., comp., net. | Systems Network Architecture/Management Services | SNA/MS |
| abbr., file.ext. | Systems Services and Technology | SST |
| abbr., scottish | Systems Technology Programme | STP |
| abbr., scottish | Systems Weapons Improvement Program | SWIP (US DoD) |
| abbr. | User Services and Systems Support | USSS |
| comp., abbr. | Web Engineered Systems and Services | WESS |
| abbr., scottish | Westinghouse Electronic Systems International Marketing Co. | WESIM (USA) |
| abbr., file.ext. | Windows Open Services/Systems Architecture | WOSA (Microsoft) |
| IT, abbr. | Xerox Network Services / Systems / Standard | XNS (Xerox, XNS) |
