Practical guides

Build spreadsheet formulas you can verify

Begin with the data model and expected result. A formula suggested by AI is a proposal to run and inspect, not proof that a spreadsheet is correct. Test on a copy before applying it to important records.

Editorial revision: 2026-10-10

Illustration generated with AI

Method

1. Describe the columns

State column names, units, types and what blank values mean. Explain the requested calculation and the spreadsheet environment. Never use zero as a silent replacement for missing information.

2. Use a known example

Create a small fictional dataset with a manually calculated result. Ask for the formula and its assumptions. Check separators, ranges and date interpretation in your actual application.

3. Test boundaries

Try blanks, zero, negative values and an added row where relevant. Compare subtotals with the overall total. Inspect which cells are overwritten and retain a way to recover the original.

Example to adapt

For two fictional items, calculate quantity multiplied by unit price: 3 × 8 and 2 × 5. The expected total is 34. Show the formula, then explain how to flag a missing unit price instead of treating it as zero.

Checklist

Checks stay on this page; ticking a box does not automatically validate the result.

Units and blank values are defined.
The known example returns 34.
New rows and totals have been tested.

0 / 3Download the checklist (.txt)

Deliverable

A checked formula, a small test dataset and documented assumptions.

Limitations

Spreadsheet syntax varies by application and locale. A correct sample does not prove every row or scenario is handled correctly.

Sources for further reading and checking

These independent resources help you find a reference. Check the language and scope: a French resource may not describe rules in another country. These are not sources automatically consulted for generated answers.

NIST — Generative AI Profile (AI 600-1)
A generative AI risk profile for identifying and managing risks.
Language: en · Scope: US
CNIL — IA générative : questions-réponses
Questions and answers on using generative AI and protecting data.
Language: fr · Scope: France / UE

Reliable source directory

Link check: 2026-10-06 · These links are reading resources. The answer service does not consult them automatically. A checked link does not guarantee every document is current.