In recent years, the use of Information Retrieval (IR) techniques to automate the localization of buggy files, given a bug report, has shown promising results. The abundance of approaches in the literature, however, contrasts with the reality of IR-based bug localization (IRBL) adoption by developers (or even by the research community to complement other research approaches). Presumably, this situation is due to the lack of comprehensive evaluations for state-of-the-art approaches which offer insights into the actual performance of the techniques.

Web applications are becoming more and more important with the rapid increase in the web environment. The maintenance of web applications is also one of the main problems in that area. Traditional maintenance approach can no longer be applied to web applications, because of the specific characteristics of web applications. In this paper, a complexity measure for web application, WCOX, is proposed. It is related to the maintenance efforts. WCOX is defined using the entropy theory and a web model extracted by static analysis. The entropy of software is regarded as an average information quantity of the software and it means the aging and degradation of the software. Most of the existing web complexity measures are simply based on count, which means that they only show limited viewpoints of a system. Since WCOX is concerned with an information quantity and understandability, it not only represents the structural complexity, but can also be used as a practical maintenance indicator. Experimental results demonstrate the applicability and effectiveness of the proposed measure.

Adaptive software needs to select most appropriate solution among multiple ways to accomplish a goal as its environment changes dynamically. This uncertainty of environment and solution makes hard to design adaptive software. Further, diversity of adaptation granularity makes architecture of adaptive software more complicated. Coordination problem between adaptive software is also an important issue. In this paper, we present a service based adaptive software framework which resolves these issues.

Agile and systematic development is important in Web application methodology because clients expect their frequent requirement changes to be implemented rapidly and regularly. However, previous studies may not be suitable for such development. In this paper we propose a methodology for agile and somewhat systematic development of Web application. The methodology includes models, tools, and an agile process. The models extended from UML focus on the behavior of Web application. The agile process aims to have quick-to-market property and adaptability to requirement changes. Tools including process manager and Web modeler support process execution and modeling activity to guide developers in applying the process. An example of university assets management system and a comparison between our methodology and other processes are given to validate our methodology.