When Gary Klein published Sources of Power in 1998, he could hardly have predicted the long-term trajectory of the work. As of June 2026, the book has surpassed 72,000 copies sold—a figure that marks it as a resounding success within the often-niche world of academic publishing. Yet, for all its current status as a foundational text in cognitive psychology, the book’s origin story is less a product of meticulous planning and more a consequence of scientific dead ends, unexpected breakthroughs, and a moment of physical misfortune.
The intellectual journey began in 1985. Klein and his colleagues, Roberta Calderwood and Anne Clinton-Cirocco, secured a research contract from the Army Research Institute with a clear, ambitious goal: to observe how firefighters made life-or-death decisions under extreme pressure, time constraints, and uncertainty. They entered the field with the expectation that they would shadow fire crews and document their real-time deliberation processes.
However, reality intervened in the form of effective municipal policy. Building codes in the Dayton, Ohio area had become so robust that fires were rare, leaving the research team with little to observe. This professional setback forced a pivot. Instead of observing ongoing events, the team shifted their methodology to a retrospective approach, asking highly experienced firefighters to recount their most challenging, high-stakes cases.
These stories proved to be a goldmine of cognitive insight. By analyzing these accounts, Klein and his team developed the Recognition-Primed Decision (RPD) model. The model fundamentally challenged the conventional wisdom of the time, which assumed that effective decision-makers spent their time comparing and contrasting various options. Instead, the RPD model demonstrated that experienced professionals rely on pattern recognition to make rapid, intuitive decisions, often bypassing the traditional, linear process of deliberation entirely.
The team presented these findings in a 1986 paper and subsequently expanded their research to other professional domains, finding consistent, confirming evidence across different types of decision-makers. Klein documented these studies in several academic outlets between 1989 and 1990. For a time, that appeared to be the end of the project. The research had been conducted, the data analyzed, and the findings formally published in peer-reviewed literature.
Yet, there was a lingering sense of incompleteness. The academic papers captured the statistics and the logic of the RPD model, but they stripped away the humanity of the experience. The method had yielded a collection of compelling, dramatic stories that simply did not fit into the rigid constraints of a journal article. Klein realized that to truly do justice to the lived experience of these experts, he needed a different medium—a book.
The challenge was that Klein did not consider himself a writer, nor did he have the time to commit to such an undertaking. The prospect of producing a book seemed, at the time, to be a professional impossibility.
The turning point arrived in 1992, during a sabbatical in Jerusalem with his wife, Helen. While the trip was intended for sightseeing and academic reflection, it took a sudden turn during a routine morning jog. While navigating a rocky, unpaved trail in a valley behind their apartment, Klein suffered a severe fall. He twisted his ankle and broke a bone, effectively ending his mobility.
What initially felt like a depressing, debilitating injury soon transformed into a unique opportunity. Immobilized and confined to his apartment, Klein decided to use the forced sedentary time to tackle the book he had long envisioned. He was due to return to the United States in one month, providing him with a strict, self-imposed deadline. He calculated that by writing eight single-spaced pages per day, he could complete a first draft of the manuscript before his departure.
The process began not with writing, but with structural preparation. He spent the first few days simply mapping out the project, creating detailed chapter outlines to ensure he could include all the necessary stories without repetition. Once he reached a sufficient level of detail, he moved to his laptop.
To maximize his output, Klein established a rigid regimen. Each night before bed, he would review the material he planned to cover the following morning, hoping to prime his subconscious to process the information overnight. Upon waking, he would immediately turn to his work. The routine proved effective; he maintained his pace throughout the month and successfully completed the first draft within his timeframe.
As the writing progressed, the scope of the project naturally expanded. The richness of the stories he had collected compelled him to reach beyond decision-making. He began to weave in related concepts such as problem-solving, the role of metaphors in cognitive processes, and the nature of expertise. He explored how professionals "read" a situation, the concept of a "team mind," and offered a critical look at the "hyper-rationality" often found in the Judgment and Decision Making (JDM) field and the Heuristics and Biases movement.
What emerged was not merely a summary of his earlier research, but a comprehensive exploration of what would later be termed "macrocognition"—a field that did not even have a name when the book was being written. Of the book’s 17 chapters, only seven focused explicitly on the decision-making process. The remainder served as a primer on how to study cognition in naturalistic settings, outside the artificial confines of a laboratory. By highlighting the strengths and capabilities of human decision-makers, the book provided a necessary counterweight to the prevailing academic trend that focused almost exclusively on human flaws and cognitive biases.
The final hurdle was publication. Lacking an agent, Klein initially submitted the manuscript to an academic press, but the editorial requirements for changes were more extensive than he was willing to accept. Fortunately, a personal connection provided a path forward. His colleague, Robert Hoffman, introduced him to an editor at MIT Press, which proved to be a perfect match for the manuscript. The partnership has been enduring, with MIT Press recently releasing a 20th-anniversary edition of the book.
The influence of Sources of Power grew well beyond its initial academic reception, thanks in part to the efforts of colleagues who believed in the importance of its message. Mike McCloskey, a colleague of Klein’s, recognized that the book’s findings held significant value for a general audience. He reached out to Tom Petzinger, a columnist for the Wall Street Journal. Petzinger, intrigued by the radical implications of the RPD model, featured the book in two separate columns, which introduced Klein’s work to a much wider public audience. The book’s profile was further elevated when author Malcolm Gladwell prominently featured it in his bestseller Blink.
Reflecting on the journey from the rocky trail in Jerusalem to the enduring success of Sources of Power, the significance remains rooted in the people who inspired it. The book was, and remains, a tribute to the firefighters, military officers, and other professionals who navigate the chaos of the real world under the weight of time pressure and deep uncertainty. It was their stories that demanded to be told, and it was a simple, painful accident that provided the quiet, isolated space for those stories to find their way onto the page. For those familiar with the standard approaches to judgment and decision science, the hope remains that Sources of Power continues to offer a different way to see the world.
