The condition states that ???all customers registered since
2001 must be in the database,??? and it is also mandatory.
??? Prioritizing quality factors: The user assigns a priority to quality dimensions.
For instance, some departments may be more interested in the accuracy of
the reported data than in timeliness. This criteria is determined for each user
and applied to each query posed. The form HIE_QTY is filled out, containing,
for each quality dimension, the dimension??™s name and a priority (a number
between 1 and 5).
Example.3:.In our running case study, we have four quality dimensions,
denoted F1 to F4: accuracy, timeliness, consistency, and completeness.
User U2, from the Sales Department (domain D1) has defined the following
priorities: 5,5,4,3, respectively. User U3, from domain D2 (Purchasing
Department) defined these other set of priorities: 4,3,5,1, respectively.
Phase.III:.Requirements.Integration
In this phase, requirements from all users and domains are unified, using a criteria
based on QFD (Akao, 1997). In the input of the phase we have (1) a query list; (b)
a hierarchy of quality dimensions; (3) a data quality requirements form; (4) data and
aggregation dictionaries; (5) a hierarchy of domains; and (6) a hierarchy of users.
The output of the phase is a set of documents containing the unified data model,
the query priorities, and the data requirements matrix.
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