I just created a page for PSP-IQ on the wiki. If you are working in ETL or Information Quality, I would really recommend familiarizing yourself with the paper and what it has to say. Very interesting reading.
This page is a decent summary of this influential theory and how it works, but not a replacement for reading the paper yourself! Also, there is some additional information for practitioners based on my own experience in applying PSP-IQ in a corporate environment.

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