What PoDQA is
PoDQA (Portal Data Quality Assessment) is a tool which is oriented towards evaluating the data quality of a Web Portal. This tool is based on a data quality model named SPDQM (Portal Data Quality Model - aligned with SQuaRE) which focuses on the user’s perspective. This tool, when applied to the model, generates an evaluation which is similar to that of data consumers. More information about the PoDQA model can be found at the following link: SPDQM
How PoDQA works
PoDQA analyzes the data quality (DQ) of Web Portals, based on characteristics that are found in the SPDQM model, and which have been divided
into four categories (Intrinsic, Contextual, Representational and Operational). The tool functions in a different, although generic, manner
for each of these categories. There are two ways in which to evaluate quality: statically and dynamically.
The tool’s static behaviour is used in two of the four categories in the quality model: the Intrinsic and the Contextual categories.
In both cases we are referring to the quality of the data in themselves, without the need for them to be used, i.e., all those aspects
of quality that data have as a result of their having been created in a particular manner.
For the Intrinsic category, which denotes that data have quality in their own right, the results obtained will thus be generic, i.e.,
independent of the portal to be analyzed, since this quality is typical of the data regardless of the use to which they will then be put.
This same behaviour is applied to the Contextual category. In this case, the quality of the data in a specific context of use (in this
case, the type of Web portal) with which an attempt is made to analyse this category, is the generic adaptation of the data to a type
of portal. The types of Web portals considered in this category are:
- The Search for and Reading of Information
- Commercial Interaction
- Interaction with other people
When using PODQA, and on the basis of the validations of the model that we have carried out, in these two categories it will be necessary
to select an user profile, which is the target of the Web portal. These profiles are formed of different demographic variables
(gender, age, level of studies, computers experience or kind of organization to which the users belong).
For the Contextual category it will also be necessary to indicate the type of portal. This information will allow you to automatically
obtain design guidelines which contain information about the most important data quality characteristics for this user profile (and this
type of portal in the case of the Contextual category). These guidelines will be useful for Web portal designers and developers since they
will allow them to discover what aspects they should consider in order to attain data quality in their Web portals.
In the dynamic functioning an attempt is made to discover the quality of the data when they are being used.
This is valid for the Representational and Operational categories. In this case, the results vary according to the Web portal being analyzed,
and the tool must therefore download and analyse all of the portal’s published pages. The evaluation does not therefore take place
immediately. When an evaluation of a portal is requested, you will be asked for a series of data with which to contact you as soon as
the evaluation is complete, at which time you it will be made available to you.