Yesterday I posted a small piece called So I’m not a Capricorn? about how astrology may (also) be completely wrong because something has changed.
On the serious side: Don’t expect that because you get it Right the First Time then everything will be just fine from this day forward. Things change.
The most known example in data quality prevention is probably that it is of course important that when you enter the address belonging to a customer, you get it right. But as people (and companies) relocates you must also have procedures in place tracking those movements by establishing an Ongoing Data Maintenance program in order to ensure the timeliness of your data.
The other thing, so to speak, is that having things right (the first time) is always seen in the context of what was right at that time. Maybe you always asked your customers for a physical postal address, but because your way of doing business has changed, you actually become much more interested in having the eMail address. And, because What’s in an eMail Address, you would actually like to have had all of them. So your completeness went from being just fine to being just awful by following the same procedure as last year.
Predicting accuracy is hard. Expect to deal with Unpredictable Inaccuracy.