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White box (software engineering)

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Title: White box (software engineering)  
Author: World Heritage Encyclopedia
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Subject: Black box, Paradiseo, Rigi (software), Concolic testing, Design Patterns
Publisher: World Heritage Encyclopedia

White box (software engineering)

A white box (or glass box, clear box, or open box) is a subsystem whose internals can be viewed, but usually cannot be altered.

Having access to the subsystem internals in general makes the subsystem easier to understand, but also easier to hack; if a programmer, for example, can examine source code, weaknesses in an algorithm are much easier to discover. This makes white box testing much more effective than black box testing, but considerably more difficult due to the sophistication needed on the part of the tester to understand the subsystem.

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