keymodels
Probability/Impact Matrix
How can probability/impact matrix support strategic choice or positioning?
Contents
The probability/impact matrix is used to determine the overall priority of each risk in the risk register to the program. It also serves as way to.
A probability/impact matrix helps a programme prioritise uncertain events by combining the likelihood of occurrence with the magnitude of effect on objectives. It also gives stakeholders a shared visual language—often red, amber and green—for discussing escalation and response. The colour or label is an aid to judgment, not the risk itself.
When to use it
- Prioritise risks recorded in a programme risk register.
- Align teams on probability, impact and escalation thresholds.
- Communicate a portfolio of risks to governance bodies.
- Reassess exposure after responses, new evidence or changing stakeholder tolerance.
Context
This artefact supports programme risk management and must be tailored to the organisation’s objectives, governance, stakeholders, delivery lifecycle and risk appetite. Define scales and thresholds before scoring live risks so that participants do not move the rules to obtain a preferred colour.
What it is
Risk probability describes uncertainty about whether an event will occur. Impact describes the consequence for agreed objectives if it does. A matrix maps the two assessments to a priority band.
Inspect each probability and impact intersection.
Select a cell to make the exact priority band explicit while keeping the complete matrix visible.
Very High
Catastrophic impact and Very High probability map to Very High in this framework.
- Impact
- Catastrophic
- Probability
- Very High
This combination sits in the matrix’s most urgent band and warrants immediate management attention.
Name an accountable owner, define an immediate response, and set a near-term review point.
The matrix can be qualitative or linked to defined quantitative ranges. Impact may need separate dimensions for benefits, cost, schedule, safety, compliance, reputation and stakeholders. Combining them into one band can hide a catastrophic consequence, so specify escalation overrides.
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