If you want to integrate risk management into decision making, you have to talk the same language as decision makers.
That means that if the decision is made based on IRR you need to calculate an alternative IRR, based on risks. If the decision is made based on NPV/EV/FV you need to calculate new NPV/EV/FV based on risks. If the decision is made based on cash flow, you need to calculate new cash flow or new budget based on risk information.
Here is an example 4 steps to integrate risk management into strategic planning
Check out other decision making books
HBR's 10 Must Reads on Making Smart Decisions (with featured article "Before You Make That Big Decision..." by Daniel Kahneman, Dan Lovallo, and Olivier Sibony)
The Art of Clear Thinking: A Stealth Fighter Pilot's Timeless Rules for Making Tough Decisions