Risk matrices are not only useless, sometimes they are dangerous. Because there is a better way to graphically show outcomes of risk analysis, even qualitative ones
Download the free risk management book at www.risk-academy.ru/en/download/risk-management-book
Check out other decision making books
RISK-ACADEMY offers online courses

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Informed Risk Taking
Learn 15 practical steps on integrating risk management into decision making, business processes, organizational culture and other activities!

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ISO31000 Integrating Risk Management
Alex Sidorenko, known for his risk management blog http://www.riskacademy.blog, has created a 25-step program to integrate risk management into decision making, core business processes and the overall culture of the organization.

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Advanced Risk Governance
This course gives guidance, motivation, critical information, and practical case studies to move beyond traditional risk governance, helping ensure risk management is not a stand-alone process but a change driver for business.
$795