Ashgrove Group has 2,140 tables across eleven source systems. Its 68 priority decisions need 186 of them.
That single change of question — from "what data do we have?" to "what do our decisions need?" — is the largest cost lever in platform design, and everything in this book is downstream of it.
Ashgrove's platform costs $4.17 million a year and supports decisions worth $18.6 million. That is 22.40% of the value it enables — defensible, but not obviously so. This book answers the three questions that follow with arithmetic rather than argument: would buying it as a service cost less, which decisions cost more to support than they return, and how many more decisions must it carry before the ratio becomes comfortable.
Two runnable models and thirty-nine check chains bind every figure in this volume to a single data sheet. Two of those chains tie it to Volumes 1 and 2 — change the earlier company's revenue and this book fails immediately. The chains caught real errors during writing, and the book says which ones.
Chapter 33 reproduces everything this volume depends on: the tier × layer map, the complete Ashgrove data sheet, and the four results from Volumes 1 and 2 that the platform arithmetic rests on.
Fourteen chapters, ten self-test questions each with explained answers. Five appendices including the capability matrix with a blank version to fill in for your own organization, and a 182-term glossary shared across the series.
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