Need somewhere to start? How about the most wanted pages; or the pages we know need more work; or even the stub that somebody else has started, but hasn't been able to finish. Or create a ticket for any issues you have found.
The data cleansing pattern specifies rules for data standardization, matching, and survivorship that enforce consistency and quality on the data it is applied against. 2008-06-13 to data quality improvementIBM - MDM Architecture pattern