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Genetic Algorithms: Search procedures that use the mechanics of natural selection and natural genetics. It uses evolutionary techniques, based on function optimization and artificial intelligence, to develop a solution.

Glass Box Testing: A form of testing in which the tester can examine the design documents and the code as well as analyze and possibly manipulate the internal state of the entity being tested. Glass box testing invloves examining the design documents and the code, as well as observing at run time the steps taken by algorithms and their internal data. See Structural Test Case Design.

Goal: The solution that the program or project is trying to reach.

Gorilla Testing: An intense round of testing, quite often redirecting all available resources to the activity. The idea here is to test as much of the application in as short a period of time as possible.

Graphical User Interface (GUI): A type of display format that enables the user to choose commands, start programs, and see lists of files and other options by pointing to pictorial representations (icons) and lists of menu items on the screen.

Gray (Grey) Box Testing: A testing technique that uses a combination of Black Box Testing and White Box Testing. Gray box testing is not black box testing because the tester does know some of the internal workings of the software under test. In gray box testing, the tester applies a limited number of test cases to the internal workings of the software under test. In the remaining part of the gray box testing, one takes a black box approach in applying inputs to the software under test and observing the outputs.