This thesis investigates the extent to which the principles of usability are incorporated in web survey software. In particular, on the user interface for editing questions as the central part of a web survey software. In this context, we have identified the following basic components: external navigation, internal navigation, menu for adding questions, button for adding questions, question settings, possible answers settings and the following functionalities: adding questions, deleting questions, copying questions, editing questions text, saving question changes, moving questions. The components and functionalities served as a basis for a comparison analysis, which showed that over time a certain level of standardization in interfaces for editing questions has emerged. The central part of this thesis presents a usability comparison test, based on a sample of eight participants who tested three tools: 1KA, SurveyMonkey and Google Forms. Five tasks were defined for this purpose, which were evaluated using a series of usability metrics. The results showed that participants preferred minimalistic user interfaces with limited options and information. Usability tests also pointed out other basic principles of usability. In conclusion, a list of recommendations is laid out for the user interface for editing questions of the web survey software 1KA.
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