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Uitgeverij De Vuurmaker

The books

Two books on the same subject from two angles: how a decision comes about, and what that means for the way an organisation sells. Part I of each is free.

The Fire Triangle Diagnostic Selling
New Cover of Diagnostic Selling
BOOK TWO · 2026

Diagnostic Selling

the Greg Trinidad Method

The method behind a sales organisation that does not begin by persuading but by establishing. Twenty-eight chapters in three parts: where it comes from, the diagnosis itself, and the design of the commercial chain — from demand generation and qualification through connection, baseline, confirmation, agreement, onboarding and aftersales.

  • 28 chapters · three parts · 427 pages
  • Part I free as pdf and epub
  • E-book € 12.99 · paperback to follow
  • Also in Dutch: Diagnostisch verkopen
To the book Part I free
Cover of The Fire Triangle
BOOK ONE · 2026

The Fire Triangle

How a decision really comes about

Why people actually start moving. Nineteen chapters about the conversation that went well and the silence that followed — and about the three conditions that precede every decision: stake, trust and urgency.

  • 19 chapters · two parts · 575 pages
  • Part I free as pdf and epub
  • E-book € 12.99 · paperback € 24.99
  • Complete in English; also in Dutch as De Vuurdriehoek
To the book Part I free

Where to start

Which book first?

TO UNDERSTAND IT

Start with The Fire Triangle

That is where the model sits: why people understand perfectly well and still do not decide, and which three conditions come first. It applies to leading, negotiating and change just as much as to selling.

Nineteen chapters
TO APPLY IT

Start with Diagnostic Selling

That book stands on its own and repeats the model in its first part, so you can begin there without having read the first book. It is also the only one available in full in English.

Twenty-eight chapters
AFTER THAT

The field books

The same way of looking, applied to leadership, sustainability, negotiation and HR. Each with its own exercises, and separate from these two.

In preparation

The publisher

Uitgeverij De Vuurmaker.

Greg Trinidad’s books are published independently by Uitgeverij De Vuurmaker, a trading name of Triban Online Group V.O.F. in Venlo, the Netherlands. For a review copy, an interview or images, everything is on the press page.

Press & media About Greg