Tolerances
By now you probably know that no software system is going to be perfect. You're going to have errors.
User errors, system errors, duplicate contacts, failed transactions, bounced emails. At one time or another some of these things are bound to happen.
So what's your limit? What's an acceptable percentage?
There is no universal standard for an acceptable set of tolerances. It's up to you to decide.
But here's the thing:
To make an informed decision on acceptable tolerances, and then to stay within those tolerances, you'll have to measure.
How are you measuring, in order to set reasonable goals, and then to ensure you're meeting those goals?
All the best,
A.