Chapter III, Data Quality-Based Requirements Elicitation for Decision Support
Systems, by Alejandro Vaisman, presents a DW design method that supports complete
and consistent elicitation of functional and nonfunctional requirements. Functional
requirements take into consideration queries issued in applications, whereas
nonfunctional requirements comprise data structures and data quality. The author
argues that traditional design methods for requirements elicitation are inappropriate
in the field of decision support systems, and presents the so called DSS-METRIQ
method. The outcomes of the method are the set of requirement documents and the
specification of the operational data sources that can satisfy user requirements. The
chapter contains also the state-of-the-art in the field of requirements elicitation and
design methods.
Section II.addresses the problems related to loading data into a data warehouse
and keeping the content of a DW up to date. This section is composed of two
chapters.
Chapter IV, Extraction, Transformation, and Loading Processes, by Jovanka Adzic,
Valter Fiore, and Luisella Sisto, is an experience report on the application of the
ETL process to real world cases. The main focus of this chapter is on designing ETL
processes for high data loading frequency, for large volumes of loaded data, and for
complex data processing/transformations.
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