Mendelow’s Power-Interest Matrix: Stakeholder Mapping for PMOs

Projects rarely die because the plan was wrong. They die because a person with power was ignored, or a group nobody rated managed to organise itself. Mendelow’s power-interest matrix is the standard tool for seeing that risk before it lands: a two-by-two grid that plots every stakeholder by how much power they hold over your work and how much interest they take in it, and hands you a default engagement strategy for each quadrant. Simple to draw, routinely cited, and much more useful when you know the two questions the grid does not ask. We will get to those.

Origins and history

Aubrey L. Mendelow presented “Environmental Scanning: The Impact of the Stakeholder Concept” at the Second International Conference on Information Systems in Cambridge, Massachusetts, in 1981; the paper is freely readable in the AIS Electronic Library. Mendelow’s 1981 paper framed stakeholder power against how fast the environment around a project was changing, a way to focus scanning effort. Gerry Johnson and Kevan Scholes later reshaped it into the clean power-interest grid practitioners recognise today, set out in Exploring Corporate Strategy.

A confession about the format. When our founder did his MBA at Cranfield in 2005, it seemed half the syllabus arrived as a two-by-two matrix: growth versus share, impact versus feasibility, power versus interest. The 2×2 endures because it is the fastest way a group can turn a fuzzy argument into a picture. There is decent research behind that instinct. A 2018 human-factors study of rapid group decision-making describes the 2×2 as the standard device for exactly this job, and identifies its quiet weakness: when a group agrees a single placement for each item, the disagreement underneath gets erased, and the differences in how people see the same item are often the most valuable information in the room. Hold that thought; it changes how you should run a stakeholder mapping session.

The model explained

Two axes: power, meaning the capacity to help or block the work, and interest, meaning how actively the stakeholder cares about the outcome. Four quadrants, each with a default posture:

• High power, high interest: manage closely. Your key players. Involve them in decisions, engage fully.
• High power, low interest: keep satisfied. Enough power to kill the work, too little interest to attend your steering group until something annoys them.
• Low power, high interest: keep informed. Often your advocates and early-warning system.
• Low power, low interest: minimum effort. Monitor periodically, no more.

The keep-satisfied quadrant deserves the most respect. It is where projects die: the disengaged executive who surfaces at month nine with a veto nobody saw coming. If your engagement plan spends more effort on friendly, chatty, low-power enthusiasts than on the powerful and silent, the matrix is telling you to rebalance.

The questions the grid does not ask

Power and interest tell you how much attention someone deserves. They do not tell you whether that person is for you or against you, and the engagement strategy changes completely with the answer. So after plotting, ask about allegiance: is this stakeholder an ally of the project’s objectives, or opposed to them?

A high-power, high-interest ally is a gift. A high-power, high-interest opponent is a sponsor-level risk, and this is the point most articles miss: managing that person closely is right, but it is not your job. Hand it to the sponsor, deliberately and explicitly. Providing top cover against powerful opposition is precisely what sponsors are for. Your job as the PMO or project manager is to make the sponsor aware early, and to arm them with the data and insight they need to refute derision when it comes, because it will come.

At the other end of the grid, allegiance changes the meaning of “minimum effort” too. A low-power opponent looks safely ignorable, but power is not fixed: there is power in coalition, and seemingly unconnected groups can find each other quickly. Social media has made it easier than ever for special interest groups and alliances to form around opposition to a project, and a dozen minimum-effort stakeholders who organise become a keep-satisfied problem you never planned for. Watch for the alliance forming, not just the individuals.

How to use it

1. List real stakeholders. Named roles and groups: “Finance Director”, “regional ops managers”, “the residents’ association”. Not “management”.
2. Score individually before you score collectively. This is the lesson from the group-decision research: have each participant place stakeholders on the grid privately first, then compare. Where the team disagrees about someone’s power or interest, that disagreement is the finding. Explore it calmly: ask what each person knows that the others might not, and let that discussion do the analysis.
3. Plot, then overlay allegiance. Mark each stakeholder as ally, neutral or opposed. The quadrant gives the default posture; allegiance tunes it, including the sponsor hand-off for powerful opponents.
4. Turn quadrants into a plan per person. Owner, channel, frequency, message. “Keep satisfied” is a posture; “the sponsor has coffee with the CFO monthly and brings the benefits dashboard” is a plan.
5. Guard the map. It is a candid political document. Keep it as a working tool for the delivery team, never a steering-pack slide; labelling your CFO “low interest” in an open meeting is a career decision.
6. Re-plot at every stage gate. This is not a run-once-and-file-away exercise. Power changes, and interest changes faster: people who could not care less while the project was on the drawing board become very interested indeed when you are about to go live. Movement between quadrants is more informative than position, and the go-live spike is predictable enough to plan for.

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When the PMO should use this

Most articles treat stakeholder mapping as a project manager’s tool. A PMO gets more from it at three other levels.

First, the portfolio. The same director can be a key player on one programme and a keep-satisfied risk on another, and the PMO is the only function positioned to see that whole picture. A portfolio-level map exposes where a single stakeholder’s mood is a systemic risk rather than a project problem, and where three projects are separately annoying the same person.

Second, governance design. Quadrant placement should drive who sits on which board, who gets which report and how escalation flows. If a keep-satisfied executive is sitting through detailed monthly steering meetings, or a genuine player only hears about the programme through a newsletter, your governance is misconfigured and the map just told you how to fix it.

Third, the PMO itself. Plot the PMO’s own stakeholders and be honest about it. A sponsor drifting from manage-closely towards keep-satisfied is the classic early signal of a PMO heading for quiet disbandment, and PMOs that never map their own position tend to discover this at budget time. We ask every PMO we work with, across sectors from finance to rail to higher education, to draw this map; the silence that follows is usually instructive.

Criticism and limitations

The grid is a snapshot of a moving picture, which is why the re-plot discipline matters more than the first plot. Two axes cannot carry attitude, which is why the allegiance overlay exists. Scoring power one-to-ten invites false precision: the value is in the conversation and the relative positions, never the decimal places. The map is politically sensitive, so treat it with the same information-handling care you would apply to any candid personnel judgement (our ISO 27001 habits help here). And a completed matrix is analysis, never action: nothing changes until the engagement plan behind it is owned and worked. The grid pairs naturally with our guide to Compliance Typology and Bases of Power, which deepens the power axis, and with the RACI matrix for formalising roles once the mapping is done. Its environmental-scanning heritage is shared with SWOT analysis.

How HotPMO can help

Start with the free workshop pack above and run the session; an hour with the right people in the room beats a week of desk analysis. If the map keeps surfacing the same uncomfortable findings, misconfigured governance, a drifting sponsor, engagement plans that exist only on paper, that is a capability signal worth acting on. Stakeholder engagement is one of the dimensions our PMO Assessment examines, and we embed alongside teams to fix what it finds rather than leaving a report behind.

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Further reading

• Mendelow, A. L. (1981). “Environmental Scanning: The Impact of the Stakeholder Concept”. Proceedings of the 2nd International Conference on Information Systems, Cambridge, MA. Available via the AIS Electronic Library: https://aisel.aisnet.org/icis1981/20/
• Freeman, R. E. (1984). Strategic Management: A Stakeholder Approach. Pitman (reissued Cambridge University Press, 2010). ISBN 9780521151740.
• Dorton, S., Smith, C. M. and Upham, J. B. (2018). “Applying Visualization and Collective Intelligence for Rapid Group Decision Making”. Proceedings of the Human Factors and Ergonomics Society 2018 Annual Meeting. https://doi.org/10.1177/1541931218621039