Books

Two books, one argument

Business numbers are only useful when people agree what they mean. Your Numbers Don't Match is for the leaders who pay for the disagreement. Your AI Is Guessing is for the head of data who has to make that meaning precise enough for AI.

Your AI Is Guessing book cover by Gavin Somers

New book

Your AI Is Guessing

Semantic layers and the head of data’s real job

AI assistants rarely get numbers wrong because the data is bad or the model is weak. They get them wrong because the rules were never written down. This book shows how to make sure every figure an assistant uses has an owner, a record and a test.

For: Heads of data, VPs of data and CDOs, and the analytics engineers who build with them

Your Numbers Don't Match book cover by Gavin Somers

Available now

Your Numbers Don't Match

The Reporting Trust field guide for leaders

Why dashboards, finance packs and spreadsheets disagree, what that Data Tax costs in slower decisions, and what to fix before you scale reporting, automation or AI.

For: Founders, CEOs, CFOs, operators and senior reporting owners

Both books · save £6

Both books for £22

Your AI Is Guessing for the head of data, and Your Numbers Don't Match for the leadership team you need on side. Bought separately they are £28.

£28 £22 Save £6 · Both books in PDF and HTML

Which one first?

Choose by the job in front of you

Free cheat sheets

Get the one-page version of each book

Enter your email to download the pack instantly. A copy goes to your inbox too.