The brief becomes criteria, or it becomes guesswork.
We begin by turning a requirement into filters that return a number. Where a rule rejects a row, the reason travels with the rejection. The result is auditable line by line.
Repeatability
The same brief run twice produces the same file, because the definition is recorded.
Currency handling
Stating the unit and basis for any monetary field instead of leaving it implied.
Industry mapping
Translating described activity into the classification your systems already use, including where it fits badly.
Bring the file you already have and we will tell you what is still usable.