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Web engineering is a new research line in software engineering that covers the definition of processes, techniques, and models suitable for Web environments in order to guarantee the quality of results. The research community is working in this area and, as a very recent line, they are assuming the Model-Driven paradigm to support and solve some classic problems detected in Web developments. However, there is a lack in Web requirements treatment. This paper presents a general vision of Navigational Development Techniques (NDT), which is an approach to deal with requirements in Web systems. It is based on conclusions obtained in several comparative studies and it tries to fill some gaps detected by the research community. This paper presents its scope, its most important contributions, and offers a global vision of its associated tool: NDT-Tool. Furthermore, it analyzes how Web Engineering can be applied in the enterprise environment. NDT is being applied in real projects and has been adopted by several companies as a requirements methodology. The approach offers a Web requirements solution based on a Model-Driven paradigm that follows the most accepted tendencies by Web engineering.

Decisions in Companies are made typically by using a number of entirely different key figures. A user experience key figure is one of many important key figures that represents one aspect of the success of the company or its products. What we aim in this article is to present to those responsible for a product a method of how a user experience key performance indicator (UX KPI) can be developed using a UX questionnaire. We have developed a UX KPI for use in organizations based on the User Experience Questionnaire (UEQ). To achieve this, we added six questions to the UEQ to measure the importance of the UEQ scales. Based on the UEQ scales and the scores given for importance, we then developed a User Experience Questionnaire KPI (UEQ KPI). In a first study with 882 participants, we calculated and discussed the UEQ KPI using Amazon and Skype. The results show that the six supplementary questions could be answered independently of the UEQ itself. In our opinion, the extension can be implemented without any problems. The resulting UEQ KPI can be used for communication within an organization as a key performance indicator.

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