diff --git a/guide/english/user-experience-research/usability-testing/index.md b/guide/english/user-experience-research/usability-testing/index.md
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 ## Usability Testing
 
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+Usability testing involves evaluating the ease of which a user or group of users can interact with a site, software application, etc. It is typically (although not exclusively) achieved by observing users as they attempt to complete a pre-determined set of tasks, with the aim of identifying any difficulties which may arise or any aspects that users particularly approve of; as well as generally noting any observations they might make. Data generated from testing can then be used to inform any subsequent design decisions. 
 
+In practice, usability testing is often an iterative process undertaken at various stages of a product's development cycle with prototypes of varying levels of fidelity. Employing a low-fidelity prototype of a website, for example, such as a paper sketch that approximates what it will look like, can be considerably more efficient than fully developing an actual website only to discover that it must be changed again.