What the data cannot answer comes back as a question.

A requirement arrives in words and leaves as criteria. The build is repeatable, because the rules are written rather than remembered. The delivered count and the approved count are the same number.

Encoding repair

Fixing characters mangled in transit before they reach a system that will mangle them again.

Format and encoding

Files prepared so they load first time, with the character handling settled up front.

Format handover

Delivery in the structure your systems already accept, tested on a sample so nothing needs reworking afterwards.

Tell us the systems it has to load into before anything is built.