Giuseppe Visaggio

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Software systems are affected by degradation as an effect of continuous change. Since late interventions are too much onerous, software degradation should be detected early in the software lifetime. Software degradation is currently detected by using many different complexity metrics, but their use to monitor maintenance activities is costly. These metrics(More)
This paper presents the external replication of a controlled experiment which compared three defect detection techniques (Ad Hoc, Checklist, and Defect-based Scenario) for software requirements inspections, and evaluated the benefits of collection meetings after individual reviews. The results of our replication were partially different from those of the(More)
During its life a legacy system is subjected to many maintenance activities, which cause degradation of the quality of the system: when this degradation exceeds a critical threshold the legacy system needs to be reengineered. In order to preserve the asset represented by the legacy system, the familiarity with it gained by the system’s maintainers and(More)
Perspective-Based Reading (PBR) is a family of defect detection techniques which have been proposed to improve the effectiveness of software requirements inspections. PBR drives individual document reading by means of perspectivedependent procedural scenarios, which are different for each inspector in the team. Based on the former PBR experiments, we(More)
This work is based on a retrospective analysis of a renewal process applied to a very aged, highly degraded software system. Some parts of the results are generalized to define a method for determining the technical and economic qualities of software system components. The work also presents a decision model for identifying the most suitable renewal process(More)
This study is based on the Structured Process Model formalism previously proposed by the same authors, and describes some techniques for scheduling an execution plan which conforms to the chosen process but adapts to all the potential changes of value of specific variables of the project. The executive plan is generated by means of Incremental Refinements.(More)
This paper presents a method for dynamic effort estimation, together with its supporting tool, and the experimental validation on a renewal project of a very aged software system. Method characteristics such as dynamic tuning and fine granularity allows the tool to quickly react to process variations. The experimental validation shows how the combination of(More)
An alternative approach to developing reusable components from scratch is to recover them from existing systems. In this paper, we apply program slicing, a program decomposition method, to the problem of extracting reusable functions from illstructured programs. As with conventional slicing first described by Weiser, a slice is obtained by iteratively(More)