Updated on 9 November 2026 by Nicolas Finet, CEO of Sortlist. This guide has been rewritten with Greiner's growth model, McKinsey's latest data on transformation success, a decision framework and practical steps for managing each type of change.
Every organisation changes, but not in the same way. Some improve what they already do, step by step. Others break with the past because the old model has stopped working. Knowing which situation you are in, and choosing the matching approach, is one of the most consequential decisions a leadership team makes.
Key takeaways
- Evolutionary change is gradual, collaborative and lower-risk; revolutionary change is fast, top-down and disruptive.
- In Larry Greiner's classic model, organisations alternate between periods of evolution and periods of revolution, and each solution eventually becomes the next problem.
- McKinsey's 2021 survey found a 30% success rate for transformations, a figure that had not moved after years of research: the method matters less than execution and follow-through.
Evolution and revolution: what is the difference?
Evolutionary change modifies and fine-tunes the existing way of working. It is incremental, takes place over time and usually involves people from all levels. It is often prompted by outside pressure, such as new technology, customer expectations or competition.
Revolutionary change is rapid, dramatic and usually driven from the top. It reshapes strategy, structure, products or culture in a short period, which may be a month or a quarter. It can include a full overhaul or rebrand. See the rebranding process and debranding for brand-level examples.
Evolution vs revolution at a glance
| Criteria | Evolutionary change | Revolutionary change |
|---|---|---|
| Speed | Gradual, step by step | Fast, concentrated in a short period |
| Driver | Continuous improvement, market signals | Crisis, "burning platform" or a deliberate leap |
| Who decides | Shared; leaders empower teams | Senior leadership, top-down |
| Risk | Lower, but may be too slow | Higher: disruption and resistance |
| Best when | The model works but needs tuning | Accepted methods have failed or the market shifts sharply |
| Communication | Ongoing and incremental | Intensive and early, with a clear start and end |
Greiner's model: growth alternates between the two
Larry Greiner's Harvard Business Review article Evolution and Revolution as Organizations Grow describes five phases of growth. Each phase begins with a period of evolution (steady growth and stability) and ends with a revolutionary period of crisis that forces a different way of managing. The dominant management styles are creativity, direction, delegation, coordination and collaboration.
| Phase | Management style | Crisis that ends it |
|---|---|---|
| 1 | Creativity | Leadership |
| 2 | Direction | Autonomy |
| 3 | Delegation | Control |
| 4 | Coordination | Red tape |
| 5 | Collaboration | Not specified in the original 1972 model |
The lesson is that smooth progression is neither inevitable nor indefinitely sustainable. Practices that fit a small company stop working as it grows, and executives at the top and the bottom both start to question them. In a revolutionary period, leaders must find a new set of practices to carry the next evolutionary phase, and those practices will in turn sow the seeds of the next crisis. For a fast-growing business, that is a reason to review structure regularly rather than wait for a breakdown. See bureaucratic leadership for the "red tape" end of the cycle.
When evolution is the right choice
- Results are slipping slowly, not collapsing.
- Your core product, customers and economics still work.
- You need buy-in: collaborative change builds capability and ownership.
- The risk of disruption (losing key people or customers) is high.
Evolutionary change fits improvements to marketing processes, customer journeys or reporting. You can measure progress with the indicators in growth marketing metrics.
When revolution is justified
- A "burning platform": survival is at stake, as with a sudden shift in costs, regulation or technology.
- The accepted methods have failed. As one project-management consultant told the Project Management Institute, "Sometimes you need that jolt, and it can be useful when the accepted methods have failed."
- A leap in strategy is needed to stay ahead, for instance a new business model, a merger or a platform change.
“Sometimes you need that jolt, and it can be useful when the accepted methods have failed.”
Randy Banks, president of Riskparadigm Inc., via Project Management Institute
History is full of firms that waited too long. Kodak, Blockbuster and Nokia are usually cited as companies that failed to adapt quickly enough to technological shifts, and the lesson drawn in business case studies is that technology alone does not guarantee survival: strategic foresight and cultural adaptability matter too. In the other direction, some firms have made a deliberate reset and recovered. Tesco's reset under an outside CEO, Dave Lewis, which emphasised transparency and serving customers, is a UK example.
Revolution does not mean silence. Fast change needs more communication, not less: explain why, what will change, what will not, and when.
Why transformations fail
Whatever route you choose, execution is the hard part. McKinsey's 2021 survey of more than 1,000 respondents reported that the 30% success rate for transformations "hasn't budged after many years of research", and that even successful transformations leave value on the table. Less than one-third of respondents said their transformation both improved performance and sustained the improvement.
The common causes are well known: no sense of urgency, no coalition behind the change, a vision that is missing or unclear, and victory declared too soon. These are the errors that John Kotter's eight-step model is designed to prevent.
Managing change in practice
For evolutionary change
- Build a guiding group from several levels and departments.
- Agree a small number of measurable goals and review them regularly.
- Give people the resources, training and authority to take part.
- Celebrate short-term wins, then repeat the cycle.
For revolutionary change
- State the case: why the current model cannot continue.
- Define the destination, the timeline and who decides.
- Protect what must not change (customers, values, core operations).
- Communicate early and often, and keep channels open for feedback.
- Embed the new way of working in processes, incentives and recruitment before moving on.
Frameworks such as Kotter's eight steps and the ADKAR model from Prosci structure the people side of either approach. Prosci's benchmarking research reports that projects with effective change management are more likely to meet their objectives. If the change is digital, our guides to digital transformation strategy and digital transformation for entrepreneurs are useful starting points.
Evolution vs revolution for your team and leadership
Revolutionary change is often led by a small group around one leader, and people become reliant on that process. Evolutionary change still needs a leader, but one who empowers others and shares responsibility. The two approaches also suit different temperaments: revolution needs quick decisions and resilience, while evolution needs patience and the willingness to delegate. Organisations are frequently pushed between the two by internal and external forces, so build skills for both.
Decision checklist
- Is the problem urgent and existential, or gradual?
- Does the current business model still work at its core?
- How much disruption can customers and teams absorb?
- Do you have the sponsorship and capacity to see a large change through?
- Have you defined how you will measure success?
Frequently asked questions about evolutionary and revolutionary change
What is the difference between evolutionary and revolutionary change?
Evolutionary change is gradual and builds on what exists. Revolutionary change is rapid and fundamental, and usually led from the top.
When is revolutionary change justified?
When accepted methods have failed, survival is at stake or a significant strategic leap is needed to stay ahead.
Does revolutionary change mean less communication?
No. It usually needs more communication, earlier, because there is less time to build understanding.
What is Greiner's growth model?
It describes five phases of organisational growth, each starting with evolution and ending in a revolutionary crisis, from creativity and leadership to collaboration.
How often do transformations succeed?
McKinsey's 2021 survey reported a 30% success rate, unchanged after years of research.
Can a company combine both approaches?
Yes. Many organisations improve most areas gradually and run a revolutionary change in one function, such as technology or brand.
Need an outside view on your change programme? Post your project on Sortlist and compare UK consultancies for free.
Sources: Greiner, Evolution and Revolution as Organizations Grow (HBR), McKinsey, Successful transformations (2021), PMI, Evolution or revolution?, Kotter, 8 steps, Prosci, ADKAR, CIPD, Change management factsheet.
