Process Impact Influence: Risk Prioritization and Stakeholder Analysis in

PMBOK v8 Definition

The Impact/Influence Grid is a stakeholder classification tool used in the Identify Stakeholders process (Project Communications Management Knowledge Area, Initiating Process Group). It maps stakeholders based on their power (impact) and interest (influence) to determine engagement priority. The Probability and Impact Matrix is a data representation tool used in the Identify Risks process (Project Risk Management Knowledge Area, Planning Process Group) that combines risk probability and impact scores to prioritize individual risks.

Why It Matters for the Exam

The PMI exam frequently tests your ability to distinguish between stakeholder prioritization tools (Impact/Influence Grid) and risk prioritization tools (Probability and Impact Matrix). Expect situational questions where you must select the correct tool based on whether the scenario describes stakeholders or risks. These concepts appear in process identification questions, tool-and-technique matching questions, and scenario-based prioritization questions.

Key Points to Remember (for the exam)

• Main Tool – Stakeholders: Impact/Influence Grid (page 200–201) – classifies stakeholders by their power to affect the project (impact) and their level of engagement (influence)
• Main Tool – Risks: Probability and Impact Matrix – maps each risk's probability of occurrence against its impact on project objectives
• Key Distinction: Impact/Influence Grid is for stakeholder classification; Probability and Impact Matrix is for risk prioritization
• Prioritization Rule: Stakeholders with the most interest and highest influence are prioritized at the top of the stakeholder list
• Scoring Scheme: The Probability and Impact Matrix uses a numeric risk-scoring scheme to give each risk a probability–impact score, allowing relative priority evaluation within each priority level
• Scale Levels: More detailed risk approaches use five levels; simpler processes use three levels
• Threat vs. Opportunity: Impact definitions are negative for threats (delay, additional cost, performance shortfall) and positive for opportunities (reduced time or cost, performance enhancement)

Typical PMI Exam Example

You are managing a construction project and need to prioritize which stakeholders require the most engagement. You have identified 15 stakeholders with varying levels of authority and interest in project outcomes. Which tool should you use? → Impact/Influence Grid – because you are classifying stakeholders by their power and interest, not analyzing risk probabilities.

PMI Exam Traps

• Trap: Confusing Impact/Influence Grid with Probability and Impact Matrix

  • Reality: Impact/Influence Grid = stakeholders; Probability and Impact Matrix = risks

• Trap: Thinking "impact" means the same thing in both tools

  • Reality: In Impact/Influence Grid, impact = stakeholder's power/authority; in Probability and Impact Matrix, impact = effect on project objectives (cost, time, scope, quality)

• Trap: Assuming stakeholder prioritization uses only one method

  • Reality: Other methods include MoSCoW (must have, should have, could have, will not have), 100-point method, cost of delay, and Kano analysis

• Trap: Forgetting that impact definitions apply to both threats and opportunities

  • Reality: The same scales evaluate threats (negative impact) and opportunities (positive impact); ethical risks, reputation risks, and morale impacts may not fit standard scales

Important PMI Connections

Quick Review Questions

1. A project manager needs to classify stakeholders based on their authority and involvement in the project. Which tool from PMBOK v8 should be used?

2. During risk identification, you need to assign a priority level to each identified risk. Which data representation technique combines probability and impact scores?

3. A stakeholder has high interest in the project but low influence. According to the Impact/Influence Grid, how should this stakeholder be prioritized?

4. When using a Probability and Impact Matrix, how do you interpret impact for opportunities compared to threats?

5. What is the difference between the "impact" dimension in the Impact/Influence Grid versus the "impact" dimension in the Probability and Impact Matrix?

PMBOK v8 Reference

Section 2.7.2 – Perform Risk Analysis (Probability and Impact Matrix) Section 5 – Tools and Techniques (Probability and Impact Matrix with Scoring Scheme, page 187) Section 4 – Process Framework (Probability and Impact Scales, Table 4-2) Section 2.5.3 – Identify Stakeholders (Impact/Influence Grid, pages 200-201) Sections 95-98, 137-138 – Identify Risks and Implement Risk Responses processes