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One of the fundamental principles of the database approach is that a database allows a nonredundant, unified representation of all data managed in an organization. This is achieved only when methodologies are available to support integration across organizational and application boundaries. Methodologies for database design usually perform the design(More)
Preparing the books to read every day is enjoyable for many people. However, there are still many people who also don't like reading. This is a problem. But, when you can support others to start reading, it will be better. One of the books that can be recommended for new readers is conceptual database design an entity relationship approach. This book is not(More)
The literature provides a wide range of techniques to assess and improve the quality of data. Due to the diversity and complexity of these techniques, research has recently focused on defining methodologies that help the selection, customization, and application of data quality assessment and improvement techniques. The goal of this article is to provide a(More)
*Dipartimento di Informatica e Sistemistica, Università di Roma "La Sapienza", Via Salaria 113, 00198 Roma, Italy, e-mail: [catarci/batini]@infokit.dis.uniroma1.it. °Dipartimento di Informatica, Università di Bari, Via Orabona 4, 70125 Bari, Italy, e-mail: fcosta@iesi.ba.cnr.it. ^Dipartimento di Scienze dell'Informazione, Università di Roma "La Sapienza",(More)
The conceptual design of databases is usually seen as divided into two steps: view modeling, during which user requirements are formally expressed by means of several user oriented conceptual schemata, and schema integration, whose goal is to merge such schemata into a unique global conceptual schema. This paper is devoted to describe a methodology for(More)
Ahtract -Diagrams are widely used in several areas of computer wience, and their effectiveness is thoroughly recognized. One of the main qualities requested for them is readability; this is especially, but not exclusively, true in the area of information systems, where diagrams are used to model data and functions of the application. Up to now, diagrams(More)
The Italian approach to e-Government is based on the development and deployment of the Unitary Network, a “secure Intranet” interconnecting all the public administrations. The Cooperative Architecture, currently designed on top of it, is the reference distributed computing model in which each administration is represented as a Domain, exchanging data and(More)