Our Iceberg Is Melting: What the Research Says About Kotter's Penguin Fable

What the book is

Our Iceberg Is Melting: Changing and Succeeding Under Any Conditions is a business fable by John P. Kotter and Holger Rathgeber. A library catalog lists the first St. Martin's Press edition as published in New York in 2006, with a 2005 copyright date, at x and 147 pages with color illustrations (Kotter & Rathgeber, 2006). Its copyright page says the authors first published the book themselves, under the subtitle Changing and Succeeding Under Adverse Conditions (Kotter & Rathgeber, 2006). Portfolio, a Penguin Random House imprint, published a revised and updated tenth-anniversary edition on January 5, 2016, at 176 pages (Kotter & Rathgeber, 2016). Both the 2006 St. Martin's edition and the 2016 edition carry a foreword by Spencer Johnson, the author of Who Moved My Cheese? (Kotter & Rathgeber, 2006, 2016).

According to its publisher, the 2016 edition keeps the original text and adds new illustrations, a revised afterword and a question-and-answer section with the authors (Kotter & Rathgeber, 2016). A British imprint, Macmillan Business, lists a new-cover hardback marking twenty years since first publication, dated June 25, 2026 (Kotter & Rathgeber, 2026).

The publisher's description says the fable is based on Kotter's research into eight steps that can produce needed change in any kind of group (Kotter & Rathgeber, 2016). A review of the model traces it to his 1996 book Leading Change (Appelbaum et al., 2012). The penguins are a way to teach them without a theory chapter.

The advice, in plain words

A colony of emperor penguins has lived on the same Antarctic iceberg for many years. The publisher lists the main characters as Fred, Alice, Louis, Buddy, the Professor and NoNo (Kotter & Rathgeber, 2016). The plot below is from the 2006 edition (Kotter & Rathgeber, 2006). Fred, a curious younger penguin, finds that the iceberg is cracked inside and could break apart. Few listen at first. Alice, one of the colony's leaders, takes him seriously and gets him in front of the Leadership Council, which Louis heads. Louis pulls together a small team that includes Buddy, who is good with others, and a scholarly penguin called the Professor, named Jordan. A visiting seagull gives the team the idea of a nomadic life, and in the end the colony moves to a new iceberg and makes scouting a lasting habit.

Put plainly, the story teaches a sequence. First, help people see the problem so they feel it is urgent. Then form a team that can lead the response and agree on where the group is going. Tell everyone, many times and in many ways. Remove what stands in people's way, show some early wins, keep pushing after the first success, and build the new behavior into how the group runs (Kotter & Rathgeber, 2006, pp. 129-131). The Kotter entry lists the eight steps in the wording his company uses today.

Why it became popular

The 2016 publisher page carries a bestseller flag, and the publisher's description says the book has changed millions of lives in organizations (Kotter & Rathgeber, 2016; Porchlight Books, n.d.). Those are the publisher's claims. I have not found an independent sales count, and I could not find a reliable source on how widely employers use the book in training.

What I can say is that it does the same job as Who Moved My Cheese?: it puts a change idea into a story short enough to read in one sitting. The 2016 audiobook runs a little over two hours (Kotter & Rathgeber, 2016). A Publishers Weekly review called it a light, quick read and a starting point for group discussions about corporate culture, group dynamics and the challenges of change (Publishers Weekly, 2006). A review of Kotter's model reached a similar conclusion about the model itself, finding that its popularity seems to come more from its direct and usable format than from scientific consensus about results (Appelbaum et al., 2012). My view: the fable makes that format even easier to pass around.

The main criticisms

The first criticism is about the story's craft. The Publishers Weekly reviewer found the fable's internal logic uneven, because the penguins behave partly like people, and said the whimsical tone will not suit every reader (Publishers Weekly, 2006). My view: that matters less than it sounds. The book is a teaching device, and readers know it.

The second criticism is about evidence. A fable can show a sequence of steps, but it cannot show that the sequence works. In the story, the steps are followed and the colony survives. That is how the authors wrote it, not a test.

The third is my view. The fable makes urgency easy. Fred's threat is real, physical and provable: the iceberg really is cracking. Most workplace changes are not like that. The danger is a forecast, people disagree about it, and sometimes the people pushing back are right. Because the threat in the story turns out to be real, the colony's resistance becomes something to overcome. That leaves little room for the employee whose doubt is a useful warning. Resistance to change covers research that treats some pushback as information.

The fourth is also my view, and it cuts the other way. The story's hero is not the head penguin. It is Fred, who has to be brought before the council, and the turning point is a leader who listens to him. That is a better picture of where change ideas come from than many corporate change plans give.

What the research says

In the Unfrozen Research Index (24,463 abstracts of research articles and reviews supplied by OpenAlex, covering 28 of the 29 journals (21 core, 7 expansion), 2007 to 2026, 2026 to date), 9 titles or abstracts mention Kotter. These are keyword counts of titles and abstracts, not of full texts, so they understate how often his model is used. One of the nine is the critique of the urgency step discussed below, first published online in 2022. Four studies bear directly on the fable's advice.

The eight steps as a package. Appelbaum, Habashy, Malo and Shafiq (2012) reviewed about 15 years of literature against each of Kotter's eight steps. According to their abstract, they found support for most of the steps, but no formal studies of the whole model and its structure. They found no evidence against it and called it a recommendable reference, best used as an implementation planning tool alongside other tools that handle context and obstacles. They also noted that the model has several limitations, and that Kotter's original work drew on his own business and research experience. Read plainly, the parts have some support. The claim that these eight steps, in this order, produce success has not been tested as a whole.

Popular models and evidence. Stouten, Rousseau and De Cremer (2018) compared widely used practitioner change models with scholarly research on change. According to their abstract, practitioners often rely on popular models that cite expert opinion more than scientific evidence, and the authors summarized what is known, contested, untested and underused in change management, ending with ten evidence-based steps. The abstract does not grade Kotter's model on its own, so I do not claim that it does. It is a useful map for anyone who wants to check the fable's lessons against the wider research.

Urgency. McLaren, van der Hoorn and Fein (2023) critiqued the first step. In their article's abstract, they argued that building urgency by convincing employees the current state is dangerous is combative, works against people's well-documented preference for the status quo, and adds to the anxiety and stress that come with change. They proposed communicating the pressing importance of the future state instead. That is one paper's argument, not a settled finding, but it lands on exactly the step the fable dramatizes best. On their reading, the melting iceberg is the risky version of urgency.

Communication. Allen, Jimmieson, Bordia and Irmer (2007) studied how employees deal with uncertainty during change. According to the abstract, interviews with 25 employees suggested that people prefer their direct supervisors for practical, job-related information during a change and look to senior management for strategic information, and that trust shapes whom they ask. A follow-up field study in an organization facing a restructure found that employees who reported receiving good-quality change communication were more open to the change, with uncertainty mediating that link. In the book, the guiding team does the communicating: Louis opens the colony meeting with a speech, Buddy tells the seagull's story, and slogans on posters keep the vision in view (Kotter & Rathgeber, 2006). This study points to the supervisor as the person employees turn to for the practical details, which puts weight on middle managers, not only on the guiding team.

A balanced verdict

What the book is good for: introducing Kotter's steps to a group that will never read Leading Change. It gives a team shared characters to point to ("who is our Fred?", "who is NoNo here?"), and it makes one point hard to forget, which is that a warning from someone outside the leadership circle deserves a hearing.

Where it misleads: it makes the steps look proven because the story turns out well, and it makes urgency look simple because the threat is undeniable. A 2012 review found support for most steps but no test of the whole model, and a 2023 paper argues the urgency step can backfire.

Compared with Who Moved My Cheese?, which puts the weight on each person's attitude, this fable puts the weight on leaders and the process they run. My view: that is a real improvement. Both are stories, though, and neither offers evidence inside the story. See the Who Moved My Cheese? review for that comparison.

The best use I can suggest is as a shared starting text, followed by a plain discussion of what is different about your own change: how certain the threat really is, who on the front line has seen it, and which steps you are tempted to skip. A simple change plan template can turn that discussion into a plan, and Leading Change gives the fuller argument behind the steps.