INPUT
What you prepare
Two redacted CSV files, each up to 10,000 rows and 20 MB, with one header row; one key column; and up to 20 comparison columns. Export XLSX to CSV on your side first.
RAINS / NARROW WORKS
Turn a monthly CSV comparisoninto a reviewable list.
Compare two redacted CSV files, separate added, removed, changed, and unchanged rows, and leave the next review order. This is one bounded operation—not a new system to maintain.
- Two redacted CSV files
- One key column
- Local-first
- About 2 business days
NARROW DIFF REVIEW
One input pair. One decision. One report.
The service starts only after the key, compared columns, and acceptance check are written down.
OUTPUT
What you receive
A CSV with added, removed, changed, and unchanged classifications, including counts; a changed-cell list; a memo of assumptions and questions; and reproduction steps for the comparison.
ACCEPTANCE
What you confirm
The four classifications, changed cells, comparison key, and assumptions are reviewable. Duplicate keys, column mismatches, or unclear blank meanings return to input review before the delivery clock starts.
BOUNDARY
What it does not do
No third-party upload, production connection, import, correction, deletion, accounting judgment, price judgment, inventory judgment, or guarantee. Do not send personal data, credentials, or customer secrets.
ILLUSTRATIVE / SYNTHETIC DATA ONLY
See what the finished work looks like.
These two small master files are invented. They show how the input pair, diff CSV, count summary, and reproduction steps connect.
No real company, product, customer, or confidential data appears here.
| id | name | group | price |
|---|---|---|---|
| P-101 | Record note | Standard | 1200 |
| P-102 | Work label | Small | 800 |
| P-103 | List card | Standard | 1500 |
| P-104 | Check tag | Small | 600 |
| P-105 | Shelf marker | Large | 900 |
| id | name | group | price |
|---|---|---|---|
| P-101 | Record note | Standard | 1200 |
| P-102 | Work label | Small | 900 |
| P-104 | Check tag | Small | 600 |
| P-105 | Shelf marker | Large | 900 |
| P-106 | Refill card | Standard | 700 |
DIFF CSV
One row per classification
classification,id,column,before,after
added,P-106,name,,Refill card
removed,P-103,name,List card,
changed,P-102,price,800,900
unchanged,P-101,,,Changed cell: P-102 / price / 800 → 900
NARROW DIFF REVIEW / FIXED SCOPE
One comparison, JPY 30,000 including tax.
About 2 business days after input review and written scope agreement. Over-limit files, a third file, or key/column design changes require an additional quote. No payment integration; work starts after written agreement.
NARROW DIFF REVIEWJPY 30,000 incl. taxFinal quote before payment
PROCESS
Separate the difference, then leave the next check.
- 01
Set the key
Confirm which rows belong together and what decision the report supports.
- 02
Run the comparison
Use deterministic processing on synthetic or redacted files. No production access.
- 03
Hand over the review order
Deliver the differences, owner, deadline, assumptions, and the rule for the next run.
RESPONSIBILITY
The customer keeps the final operational decision.
- Files
- The customer keeps real files and prepares redacted CSV copies when needed.
- Judgment
- The customer decides whether a difference is correct and whether any record should change.
- Operation
- Narrow Works does not import, update, delete, monitor, or operate the source system.
NEXT / SCOPE CHECK
Describe one comparison that repeats every month.
File shape, key, and deadline are enough. Do not send real customer files, personal data, credentials, or customer secrets. Work starts after input review and written scope agreement.