Most entrepreneurs who journal do it inconsistently, abandon it after a few weeks, and feel vaguely guilty about the gap between how often they mean to do it and how often they actually do. The framing around journalling tends to sit in the wellness space — self-care, gratitude practice, emotional processing — which makes it easy to deprioritise when things get busy.

The research on what journalling actually does to strategic decision-making is considerably more specific and considerably more relevant to building a business than that framing suggests. This is not an article about self-care. It is about a cognitive mechanism that measurably improves the quality of decisions made under uncertainty — which is most of what entrepreneurship consists of.

What reflection actually does to performance

Francesca Gino and colleagues at Harvard Business School, HEC Paris, and UNC conducted a ten-study programme examining whether reflection on accumulated experience outperforms accumulating additional experience. The answer, across 4,340 participants in diverse environments, geographies, and populations, was consistent: the marginal benefit of reflecting on previous experience was superior to the marginal benefit of additional practice.

In one experimental study, participants who reflected on their strategies after an arithmetic task performed 18% better in a subsequent round than those who had not reflected. A field study at Wipro, a business process outsourcing company, showed approximately 23% better performance in groups that reflected after their learning experience compared to those who had not. The researchers found that this effect was mediated by self-efficacy — reflection builds confidence in the ability to execute, which in turn improves subsequent performance.

The finding challenges one of the most entrenched assumptions in entrepreneurial culture: that doing more is always better than pausing to think. When given a choice between practising a task and reflecting on their previously accumulated practice, most people choose the former. The research shows this preference is consistently mistaken.

For an entrepreneur running a business, this translates directly. Every week of experience without structured reflection produces less learning than it should. The experience accumulates. The compounding does not. A founder who has been operating for three years with no systematic reflection process has less learning extracted from those three years than one who has reflected regularly — even if they have accumulated more raw experience.

The preference for doing over reflecting is almost universal. The research showing that preference leads to worse outcomes is equally consistent. The gap between the two is where most learning gets lost.

What writing does to working memory

The second mechanism is neurological and explains why writing specifically — not just thinking — produces the cognitive benefits that journalling research documents.

Working memory (the cognitive workspace where active thinking occurs, housed primarily in the prefrontal cortex) has a sharply limited capacity. Research suggests most people can hold between four and seven pieces of information in working memory simultaneously. Beyond that threshold, the cognitive system becomes crowded and higher-order processing degrades.

For an entrepreneur, working memory is continuously occupied by open loops: unmade personnel decisions, unresolved financial concerns, outstanding communications, ongoing strategic questions. Each of these occupies cognitive space that would otherwise be available for the kind of sustained, integrative thinking that strategic decisions require. The founder who sits down to think through a major strategic question while carrying twenty unresolved operational concerns in working memory is not bringing their full prefrontal capacity to the question. They are bringing what is left over.

Writing externalises the open loop. The act of committing something to paper closes it in working memory — not because the problem is solved, but because the brain’s monitoring system no longer needs to hold it active. James Pennebaker’s expressive writing research, which by 2009 had produced over 200 studies examining writing’s effects on cognition, health, and behaviour, established that writing specifically activates the kind of cognitive processing that produces insight and coherent narrative. Pennebaker’s language analysis found that writers who produced higher levels of cognitive words — “because,” “realise,” “consider,” “reason” — demonstrated the kind of active sense-making that distinguishes productive reflection from rumination.

The practical consequence for founders is that journalling before a high-stakes decision is not preparation in a conventional sense. It is a working memory clearance operation that makes the prefrontal cortex available for the quality of processing the decision deserves.

What distance does to bias

The third mechanism is the most directly relevant to strategic decision quality. Research by Ethan Kross and Igor Grossmann at the University of Michigan established that psychological distance from a decision — viewing it from a removed rather than immersed perspective — measurably reduces the cognitive biases that distort strategic judgement.

Their research on self-distancing found that participants who reflected on decisions from a distanced perspective (writing in the third person, or imagining how they would view the situation from one year in the future) showed significantly less probability-weighting distortion than those who reflected from an immersed first-person perspective. The distancing was not a relaxation technique. It was a bias-reduction tool with measurable effects on decision quality.

For entrepreneurs, the decisions where bias is most acute are the ones with the highest emotional stakes: whether to let go of a poor hire who has been with the company from the beginning, whether to abandon a product direction that has significant prior investment behind it, whether to end a partnership that is not working. These are precisely the decisions where emotional immersion distorts the assessment most severely — and where a structural tool for creating cognitive distance has the most practical value.

A specific journalling practice that operationalises this mechanism: writing about a pending decision as though advising a colleague facing the same situation, or writing a future retrospective — looking back from six months forward on how the decision played out and why — structurally produces the self-distancing that Kross’s research shows reduces bias. The writing is not recording a conclusion. It is creating the cognitive conditions under which a better conclusion becomes possible.

Two biases that journalling specifically addresses are worth naming. Hindsight bias makes outcomes look more predictable in retrospect than they were at decision time, producing false lessons about what should have been obvious. Outcome bias judges the quality of a decision process by its outcome rather than by what was known when the decision was made. Both feel like honest reflection from the inside. Neither is. A journalling practice that anchors analysis to what was known at decision time — rather than what was learned afterward — is a structural correction for both.

The evidence is stronger than the culture around it suggests

The reason most entrepreneurs underinvest in reflection is not that they have evaluated the evidence and found it unconvincing. It is that the cultural framing around journalling sits in a space — wellness, self-development, morning routines — that the average founder deprioritises when operational demands increase. The practice gets associated with a particular type of productivity content rather than with what the research actually shows it does.

Di Stefano and Gino’s finding is worth stating plainly: across ten experimental studies, involving thousands of participants, in multiple countries and contexts, pausing to reflect on accumulated experience produced better subsequent performance than continuing to accumulate experience without reflection. The effect was not small and it was not confined to particular task types. The marginal return on reflection exceeded the marginal return on practice.

The expressive writing literature’s effect size across over 100 studies averages approximately 0.16 — modest in absolute terms, consistent in direction across a large and diverse evidence base. The working memory offloading mechanism has experimental support from Pennebaker’s programme and from research on pre-sleep writing tasks, which found that writing out outstanding concerns before bed reduced the rumination that delays sleep — not because the problems were solved but because the writing closed them in working memory.

These are not soft findings about feeling better. They are cognitive performance findings about how the brain processes experience, manages working memory, and produces the conditions for unbiased judgement. Entrepreneurs who treat journalling as a wellness practice are accessing a fraction of what the research shows it can do. Entrepreneurs who treat it as a cognitive tool are using it for what it actually is.

What a useful journalling practice looks like

The research points toward specific rather than general practice. A journal that records events without extracting implications produces less benefit than one that asks structured questions about what the experience means and what it predicts.

Three questions that operationalise the Di Stefano mechanism: What did I expect to happen today, and what actually happened? What does the gap between those two things tell me about my assumptions? What would I do differently if I faced the same situation again?

For the cognitive offloading mechanism: writing out all open loops — pending decisions, unresolved concerns, outstanding questions — at the start of a reflective session before moving to strategic thinking. The list does not need to be actioned. Its function is externalisation. Writing it transfers it out of working memory.

For the self-distancing mechanism: when journalling about a high-stakes pending decision, writing about it in the third person — “what would I tell a founder who was facing this situation?” — or from a future vantage point: “looking back from six months from now, what did the right decision turn out to be, and why?” Both framings create the psychological distance that reduces the emotional immersion that biases the assessment.

The research on when reflection is most beneficial is also worth noting. Di Stefano and colleagues found that reflection is mostly beneficial at the beginning of the learning curve and when there is sufficient accumulated experience on which to reflect. A founder in their first month of a new venture has less to extract than one in their second year. The returns on reflection compound with the experience base it is applied to.

A book worth reading alongside this

Chatter by Ethan Kross is the most direct starting point. Kross is the primary researcher on self-distancing and the relationship between inner dialogue and decision quality, and the book translates his research for a general reader without losing the rigour behind it. His treatment of when inner dialogue helps and when it loops into unproductive rumination — and specifically of how writing changes the relationship to internal chatter — maps directly onto the third mechanism this article describes. For any entrepreneur who wants to understand the cognitive science behind why some forms of reflection improve thinking and others worsen it, it is the most specific and credible place to start.

This article discusses psychological and cognitive patterns documented in research on reflection, expressive writing, and decision-making. It is not designed to identify, diagnose, or assess any psychological condition, and it is not a substitute for professional support. If you are experiencing persistent rumination, anxiety, or difficulty with decision-making that is significantly affecting your work or wellbeing, speaking with a psychologist can provide support that goes further than a journalling practice.

This article is for educational and informational purposes only. It is not a substitute for professional psychological advice, diagnosis, or treatment. If you are experiencing significant psychological distress, please consult a qualified mental health professional.

Sources: Di Stefano, G., Gino, F., Pisano, G. & Staats, B.R. (2014/2023), Management Science, N=4,340, ten studies. Pennebaker, J.W. & Beall, S.K. (1986), Journal of Abnormal Psychology, 95(3). Pennebaker, J.W. (2018), Perspectives on Psychological Science, 13(2). Kross, E. & Grossmann, I. (2012), Journal of Experimental Psychology: General, 141(1). Sun, Q. et al. (2018), Frontiers in Psychology. Scullin, M.K. et al. (2018), Journal of Experimental Psychology: General.