This information will be used for the design and
implementation of the ETL process.
Summary.and.Research.Directions
In this chapter we showed that methodologies for software development in operational
systems do not apply in the DSS setting. Based on this conclusion, we presented
a methodology for requirements elicitation with focus on data quality dimensions
and data source selection. The methodology aims at finding out if the data currently
available in the operational data sources allow answering a set of queries (functional
requirements) satisfying certain data quality conditions (nonfunctional requirements).
In order to quantify the answer to such question, we adapted the quality
84 Vaisman
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function deployment (QFD) technique. Finally, DSS-METRIQ specifies the set of
forms needed to support the requirements elicitation process.
Future research directions include a Web-based implementation of the framework,
currently in progress, and developing a data source selection engine that can deliver
different combinations of data sources fulfilling the requirements with different
levels of quality. Data quality evolution, and how it affects data source selection,
allowing dynamically changing the data source being selected, must also be accounted
for in future work.
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