Tacainfo · Transfer and handover
The brief becomes criteria, or it becomes guesswork.
Nothing is sourced until the shape of the audience is settled. Standardisation happens before matching, never the other way round. Delivery includes a plain statement of what the file will not do.
Change log
A note of what each processing stage altered, kept so the build can be retraced.
Record identifiers
Giving every row a stable key so a later refresh can be matched against this one.
Phone formatting
Rendering numbers in a consistent international form, with the original retained.
If it turns out your existing data is fine, that is a perfectly good outcome.