Title:	EARLY ANALYSIS OF USABILITY REQUIREMENTS
Author(s):	Luiz Marcio Cysneiros , Vera Werneck
ISBN:	978-972-8924-85-0
Editors:	Katherine Blashki
Year:	2009
Edition:	Single
Keywords:	Requirements Engineering, Non-Functional Requirements, Usability, Goal-Oriented Analysis
Type:	Full Paper
First Page:	27
Last Page:	36
Language:	English
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Full Contents:	click to dowload
Paper Abstract:	Usability is becoming increasingly recognized as being an important factor in the acceptance of systems by end users. In order to ensure usable systems we must ensure identification of appropriate requirements regarding these critical aspects of systems. However, many challenges make this a difficult job. For example, it is usually difficult to quantify and precisely specify these qualities in software systems. Furthermore, some alternatives that would improve usability might jeopardize other requirements such as security. There is a basic need for systematic approaches to reason, model and analyze usability from the early stages of the software development. Moreover, it is necessary to develop a usable ontology or classification of measurable aspects of usability that can be used to aid in the specification of usability requirements. These ontologies should be represented in a way that facilitates their use as guidelines for the requirements elicitation process. This work builds on review of literature in the area of human-computer interaction and the emerging field of usability engineering in developing a catalog of usability aspects that should be considered during requirements gathering. This catalogue is used to guide the developer through alternatives for achieving usability. The approach is based on the use of the i* framework, having usability modeled as a special type of goal. We show how usability can be modeled through different viewpoints with different alternatives for operationalizing it. An example in the health care domain is used to illustrate.
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