Abstract
The usefulness of a system is determined by its functionality and also by its characteristics such as security, reliability, usability, performance, among others. However, these non-functional characteristics typically receive little attention and are less understood that the functional ones and, in addition, the literature contains several classifications of requirements (RNF), making it more difficult the understanding of this type of requirement. This paper aims to propose a taxonomy for requirements (NFR) developed by unifying diverse taxonomies in the existing literature. The proposed taxonomy covers 90 RNF aspects, and can be used as a guideline during the elicitation of user requirements, a way of organizing the requirements, facilitating the verification and validation and even reuse of these requirements.
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