You keep three copies of your data (two backups plus the copy that's in use) on two types of media with one copy off-site.
3GL
See third generation language.
3NF
See third normal form.
4GL
See fourth generation language.
5GL
See fifth generation language.
80/20-rule
In the Dynamic Systems Development Method (DSDM), the assumption that 80 percent of an application's features will take 20 percent of the project's total time to implement. (The 80/20-rule often applies to other situations too. For example, 80 percent of the bugs are usually contained in 20 percent of the code.)
acceptance test
A test to determine whether the finished application meets the requirements.
ACM
Association for Computing Machinery.
ACS
Australian Computer Society.
activation
See execution specification.
activity diagram
In UML, a diagram that represents workflows for activities. They include several kinds of symbols connected with arrows to show the direction of the workflow.
adapter, wrapper, or translator
A design pattern that provides a simplified interface to a class.
adaptive development model
A development model that enables you to change the project's goals if necessary during development.
administrator
Someone who manages the development team's ...
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