| State transition diagram (STD) - | (Software Engineering) a notation for behavioral modeling |
| Stepwise refinement - | (Software Engineering) a technique for accomplishing functional decomposition or procedural design (also called partitioning) |
| Structured programming - | (Software Engineering) a design method that limited design constructs to only three basic forms and constrains program flow for better quality |
| System engineering - | (Software Engineering) focuses on the analysis and design of all elements of a complete product, service, or technology for the transformation of information or control |
| Task analysis - | (Software Engineering) a software engineering action that is conducted as part of user interface design; intended to better understand how a user is to interact with a system |
| Test case design - | (Software Engineering) a set of techniques for deriving effective test cases |
| Tools - | (Software Engineering) application software used to perform software engineering tasks (e.g., design tools, testing tools); see also CASE tools |
| UML (Unified Modeling Language) - | (Software Engineering) a comprehensive diagrammatic notation for the analysis and design of software |
| Unified process - | (Software Engineering) a "use-case driven, architecture-centric, iterative and incremental" software process that emphasizes the use of UML notation |
| White box testing - | a test case design technique that makes use of a knowledge of the internal program logic |