| Abbreviation | Definition |
|---|---|
| ISST | International Society for Software Testing |
| ISSU | In Service Software Update |
| ISSU | In Service Software Upgrade |
| ISSW | IBM Software Services for WebSphere |
| ISTB | Irish Software Testing Board |
| ISTG | Inter Site Topology Generator |
| ISTOS | Innovative Software Technologies for Open Solutions |
| ISTQB | International Software Testing Qualification Board |
| ISTS | Integrated Software Training Solutions |
| IS-U | Industry Specific for Utilities |
| ISV | Indepemdent Software Vendor |
| ISV | Independent Software Vendor |
| ISV | Independent Software Vendors |
| ISVP | Independent Software Vendor Program |
| IT | Indent Tab |
| ITA | Information Technology Agent |
| ITA | Intelligent Text Analyser |
| iTAM | Internet Tax and Assessment Management |
| ITAP | Ice Tea Active Pages |
| ITCM | IBM Tivoli Configuration Manager |