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This paper proposes a feature selection technique for software clustering which can be used in the architecture recovery of software systems. The recovered architecture can then be used in the subsequent phases of software maintenance, reuse and re-engineering. A number of diverse features could be extracted from the source code of software systems, however, some of the extracted features may have less information to use for calculating the entities, which result in dropping the quality of software clusters. Therefore, further research is required to select those features which have high relevancy in finding associations between entities. In this article first we propose a supervised feature selection technique for unlabeled data, and then we apply this technique for software clustering. A number of feature subset selection techniques in software architecture recovery have been proposed. However none of them focus on automated feature selection in this domain. Experimental results on three software test systems reveal that our proposed approach produces results which are closer to the decompositions prepared by human experts, as compared to those discovered by the well-known K-Means algorithm.

One of the most important factors for the success of a software application is user acceptance by having a usable user interface. Since summer 2007 in our project regarding mobile phone application, we have combined Extreme Programming and User-Centered Design methodologies aiming to deliver usable and useful software. The HCI instruments we have integrated are: user studies, personas, usability expert evaluations, usability tests, automated usability evaluations in the form of extended unit tests, as well as lightweight prototypes. After one and half years we conducted a retrospective full-day workshop with our off-site usability engineer to reflect on the adopted process regarding the HCI instruments. This paper presents those reflections - the lessons that we learned.

Mobile computing is leading a revolution. Multimedia consumption on mobile devices is increasing day by day. The most important factor for the success of such applications is user acceptance. Additionally, the success of a software development project is associated not only with tools and technologies but also depends on how much the development process is both user-centered and developer-oriented. We are working on a project to develop a multimedia streaming application for mobile phones. The paper describes our adopted development process: the integration of Extreme Programming (XP) --- one of the popular agile methods --- with User-Centered Design (UCD) and shows how the integrated process facilitates user-orientation and at the same time preserves the social values of the development team. The paper also presents a summary of a recently carried out usability study.

Agile processes encourage embracing change in an efficient and flexible manner. Extreme Programming (XP), being a popular agile methodology, has been widely experimented with by software development teams and many case studies have been presented by the research community. Our team has employed the XP methodology to develop a mobile multimedia application. The aim of this paper is to define our project and team setup and the prevailing XP environment in order to highlight various aspects of our process.