Out now on Amazon

The Decisions Matter Toolkit

Learn to Navigate Life's High-Stakes Decisions with Mental Models.

Available in paperback and Kindle. 196 pages.

You already make thousands of decisions every day. The Decisions Matter Toolkit teaches you to make the ones that matter — brilliantly. It translates the mental models used by the world's best strategic thinkers into a practical, repeatable 6-step system for your career, your relationships, and your finances.

Why most capable people still decide badly under pressure

It is rarely a lack of intelligence. It is invisible forces we were never taught to recognise — stress, artificial urgency, and cognitive bias — that hijack us precisely when the stakes are highest. This book gives you the structural defences to protect you from your own brain, and a calm, repeatable process to fall back on when it matters most.

The system, as software.

DecisionsMatter.ai runs the same 6-step method on your real decision — framing, mental models, bias detection, and a clear verdict. Your first analysis is free.

Analyse my decision →

What's inside

A complete thinking toolkit

40
Cognitive biases
Identify and neutralise the hidden saboteurs that quietly distort your choices — from the Sunk Cost Fallacy and Loss Aversion to the Optimism Cluster.
30
Mental models
Build a latticework of powerful models — Inversion, the 10/10/10 Rule, the Reversibility Ladder, Expected Value — tailored for real decisions.
6
Step execution engine
Master the exact architecture that powers the DecisionsMatter.ai platform: Capture, Frame, Model, Detect, Stress-Test, Decide.
20 min
The Pre-Mortem
An exercise in productive pessimism designed to break your decision before you make it — saving you years of regret and compounding cost.

About the author

Harish Keswani is a marketing strategist and techno-marketing specialist with 25+ years of experience across 120+ B2B and B2C brands, and a second-time entrepreneur. The Decisions Matter Toolkit is the foundation of his work on practical AI applications for how people and organisations navigate complexity — the same thinking that powers the DecisionsMatter.ai decision assistant.

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