| Integration testing - | (Software Engineering) a testing step that constructs the software while testing it |
| Integration - | (Software Engineering) the specific approach to integration testing |
| Interoperability - | (Software Engineering) the degree to which one application communicates or interfaces with another |
| ISO 9001:2000 - | (Software Engineering) a quality assurance standard that applies to software engineering |
| Joint application development (JAD) - | (Software Engineering) a specific FAST technique |
| Levels of abstraction - | (Software Engineering) the degree of detail with which some representation of the software is presented |
| Line-of-code metrics - | (Software Engineering) measures of quality or productivity that are normalized using lines of code produced |
| Load testing - | (Software Engineering) a testing task that determines how software (often a WebApp) will respond to various loading conditions |
| LOC - | (Software Engineering) lines of code |
| Loop testing - | (Software Engineering) a white box testing technique that exercises program loops |