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{{Userspace draft|source=ArticleWizard|date=October 2010}}
'''Component-Based Usability Testing (CBUT)''' is a testing approach which aims at empirically testing the [[usability]] of an interaction component. The latter is defined as an elementary unit of an interactive system, on which behaviour-based evaluation is possible. For this, a component needs to have an independent, and by the user perceivable and controllable state, such as a radio button, a slider or a whole word processor application. The CBUT approach can be regarded as part of [[component-based software engineering]] branch of [[software engineering]].▼
▲Component-Based Usability Testing (CBUT) is a testing approach which aims at empirically testing the [[usability]] of an interaction component. The latter is defined as an elementary unit of an interactive system, on which behaviour-based evaluation is possible. For this, a component needs to have an independent, and by the user perceivable and controllable state, such as a radio button, a slider or a whole word processor application. The CBUT approach can be regarded as part of [[component-based software engineering]] branch of [[software engineering]].
==Theory==
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Meta-analysis on the data from several lab experiments that used CBUT measures suggests that these measures can be statistically more powerful than overall (holistic) usability measures <ref name="Brinkman2008">Brinkman, W.-P., Haakma, R., & Bouwhuis, D.G. (2008). Component-Specific Usability Testing,'' IEEE Transactions on Systems, Man, and Cybernetics - Part A'', vol. 38, no. 5, pp. 1143-1155, September 2008. [http://mmi.tudelft.nl/~willem-paul/WP_Papers_online_versie/Component_specific_usability_testing_preliminary_version.pdf preliminary version] [http://dx.doi.org/doi:10.1109/TSMCA.2008.2001056 online]</ref>.
==Usability
Whereas holistic oriented usability questionnaires such as [[System Usability Scale]] (SUS) examine the usability of a system on several dimensions such as defined in [[ISO 9241]] Part 11 standard effectiveness, efficiency and satisfaction, a Component-Based Usability Questionnaire (CBUQ) <ref name="Brinkman2009"> Brinkman, W.-P., Haakma, R., & Bouwhuis, D.G. (2009), Theoretical foundation and validity of a component-based usability questionnaire, ''Behaviour and Information Technology'', 2, no. 28, pp. 121 - 137. [http://mmi.tudelft.nl/~willem-paul/WP_Papers_online_versie/The_theoretical_foundation_and_Validity_of_a_component_based_usability_questionnaire_preliminary_version.pdf preliminary version] [http://mmi.tudelft.nl/~willem-paul/mp3player/Intro.htm MP3 example study] [http://dx.doi.org/DOI:10.1080/01449290701306510 online]</ref>
is a questionnaire which can be used to evaluate the usability of individual interaction components, such as the volume control or the play control of a MP3 player. To evaluate an interaction component, the six Perceived Ease-Of-Use (PEOU) statements from the [[Technology acceptance model]] are taken with a reference to the interaction component, instead of to the entire system, for example:
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* [[Cognitive ergonomics]]
* [[Human–computer interaction]]
* [[Usability
* [[Usability testing]]
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