| User hierarchy - | (Software Engineering) a hierarchical representation of the categories of users that will interact with any type of software |
| User-story - | (Software Engineering) a usage scenario that is used as part of Extreme programming |
| Validation - | (Software Engineering) tests to ensure that the software conforms to its requirements |
| WebApps (Web Applications) - | (Software Engineering) any application that delivers meaningful content or functionality to end users via the Web. |
| Web engineering - | (Software Engineering) the application of software engineering principles, concepts, and methods (or adaptations of them) to the development of Web-based applications or systems. |
| White box testing - | a test case design technique that makes use of a knowledge of the internal program logic |
| Work breakdown structure (WBS) - | (Software Engineering) the set of work tasks required to build the software; defined as part of the process model |
| Work flow - | (Software Engineering) the sequence of tasks that are required to accomplish some activity or action; often (but not always) used in conjunction with software process models |
| Work product - | (Software Engineering) any cohesive and persistent information that is produced as a consequence of one or more software engineering actions of tasks |
| AAC - Autoclaved Aerated Concrete | (Concrete Engineering) Exceptionally lightweight precast concrete with high thermal qualities and fire resistence. Suitable for cutting with ordinary hand tools. Mix design is composed of portland cement, sand or siliceous material, lime, gypsum, finely powdered aluminum, and water. Initial mix is a combination of portland cement, sand, lime and gypsum to produce a slurry. Finely powdered aluminum mixed into a paste is added prior to placement into large, rail-like forms. The finely powdered aluminum reacts with the alkaline components of the cement and lime to produce hydrogen gas, which increases the volume approximately five times producing a uniformly, dispersed cellular structure. Units are cut to required shape. Units are placed in an autoclave, an enclosed pressurized chamber, and steam cured at 3500 F. Approximately 80% of the ultimate volume consists of air voids. |