If a workbook built years ago is still passed from person to person with warnings not to change it, this book is for you. The same problem may sit in a saved inbox search, a script, a local database, a paper list, or an account only one worker can open.
The Spreadsheet That Runs the Company teaches a narrow, authorized investigation of the unofficial tools and missing records behind one completed piece of work. Start with a result that was accepted and trace it backward through source records, working copies, calculations, decisions, handoffs, proof of delivery, and records that must be kept. Build an inventory that names what each tool does, who maintains it, who can recover it, and what stops when it disappears.
Use inspection procedures for spreadsheets, inboxes, saved searches, documents, scripts, local databases, accounts, calendars, and paper tools without experimenting on live work. Exercises recover know-how through demonstrations, hard cases, repair tests, questions about starting from a blank file, and having another person repeat the method. Evidence rules separate what you saw, what a document supports, what you inferred, and what remains unknown.
Give each important tool a clear outcome: protect it, document it, repair it, connect it, replace it, retire it, deliberately leave it local, or stop until the right person can review it. Continuity packs, restore tests, manual fallbacks, replacement checks, ways back to the old method, and review dates turn the decision into usable work.
AI appears only where it can help compare records, draft instructions, explain formulas, or suggest tests. Access limits, human review, corrections, logs, exports, and stop controls remain visible. The final section shows how to offer a small recovery service, test demand by doing the work manually, and decide whether a stable part should become software at all.
This is not a surveillance plan, a spreadsheet formula course, or an argument for replacing every local tool. It is a practical method for finding what the company already depends on, preserving what matters, and changing only what can be tested.
