Spreadsheet services
Spreadsheet automation services
Important spreadsheets are often inherited: built years ago by someone who has moved on, with hidden tabs, links to other files and formulas nobody dares change. Automating such a spreadsheet without understanding it first risks automating its errors. A spreadsheet automation service starts with a review: what the workbook does, where its data comes from, which parts are fragile and whether its results are right. Only then are manual steps replaced, with tests against known results and documentation the next person can follow.
Below: what a spreadsheet review looks for, testing against known results, documentation and naming an owner.
Illustrative diagram
Spreadsheet service
- Review
- Hidden logic
- External links
- Automate
- Imports
- Checks
- Test
- Known results
- Kept test cases
- Handover
- Documentation
- Owner and cover
What a spreadsheet review looks for
Structure
- Hidden tabs, rows and columns
- Links to other files
- Named ranges and their use
Logic
- Hard-coded numbers inside formulas
- Inconsistent formulas down a column
- Lookups that fail silently
Process
- Manual steps each update
- Who updates it and when
- Who relies on the results
Testing against known results
Before automating, pick past periods where the results are known to be right, perhaps because they match the accounts or were checked by hand. Run the automated version on the same inputs and compare. Differences reveal either a mistake in the new process or a long-standing error in the old one; both need resolving with the owner before going live. Keep these test cases so they can be rerun after any future change.
Sometimes the review shows the existing figures have been wrong for a while; agree how to tell the people who relied on them.
How the service runs
Review
Structure, logic and manual steps examined.
Output: Review notes
Agree changes
Owner decides what to fix, automate or leave.
Output: Change list
Automate
Imports, checks and scripts added to a copy.
Output: Automated copy
Test
Copy compared with known results.
Output: Verified results
Switch over
Copy replaces the original, which is archived.
Output: Live spreadsheet
Work on a copy
Changes should be made to a copy while the original keeps working, so the business is never without its spreadsheet. Once the copy passes its tests, switch over on an agreed date, archive the original and tell everyone where the new one lives. Remove or redirect any links that pointed at the old file.
Documentation that helps the next person
| Item | Contents |
|---|---|
| Purpose | What the spreadsheet answers and who uses it |
| Sources | Where each import comes from and how often |
| Tabs | What each tab holds and which can be edited |
| Checks | What each check tests and what to do if it fails |
| Scripts | What each does and how to run it |
| Owner | Who maintains it and who covers for them |
Example: a pricing workbook
Illustrative example — not a client case study
Situation: A business calculates trade prices in a workbook built by a former employee, with links to supplier files and a hidden tab of overrides.
- The review finds two supplier links pointing to outdated files and several hard-coded overrides.
- The owner decides which overrides are still valid; supplier files are imported from a shared folder instead.
- Last quarter's price list is regenerated and compared with what was issued; differences are explained.
What this shows: The workbook became understandable, and price updates no longer depended on one person. This example is illustrative.
What you should receive
Findings
- Review notes
- List of fixes made and declined
Spreadsheet
- Automated version
- Test cases and results
- Archived original
Support
- Documentation tab
- Named owner and cover
- Contact for problems
Naming an owner
Every important spreadsheet needs an owner who approves changes and someone who can cover for them. Walk both through the automation, the checks and the documentation, and make sure both can run every step without help.
Common review findings
Stale links
Formulas still reading files that are no longer updated.
Silent overrides
Typed numbers replacing formulas in a few cells.
Partial ranges
Totals that stop short of the latest rows.
Duplicated logic
The same calculation done differently on two tabs.
Knowing the limits
A review sometimes shows that a spreadsheet is doing a system's job: several people editing it at once, data that must not be lost, or calculations that customers rely on directly. In those cases, automating it may only be a stop-gap. Say so clearly, automate the most fragile steps to reduce risk now, and plan a move to a proper system where it makes sense.
Access during the work
Share a copy rather than the live file where possible, and remove access once the work is handed over.
Questions about spreadsheet automation services
Why review a spreadsheet first?
Inherited workbooks often hide links, overrides and errors that automation would repeat.
How are results verified?
By comparing the automated version with past periods whose results are known to be right.
Will our spreadsheet be out of action?
No, changes are made to a copy while the original keeps working.
What if the old figures were wrong?
The owner decides how to correct them and tell the people who relied on them.
What documentation do we receive?
Purpose, sources, tabs, checks, scripts and owner, kept with the spreadsheet.
Who maintains it afterwards?
A named owner, with someone able to cover.
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