The Confidence Code

In a revealing 2011 study, Hewlett-Packard analyzed its own internal promotion data to solve a puzzle: why weren't more women in top management positions? They discovered that women would only apply for a promotion when they believed they met 100 percent of the qualifications listed for the job. Men, in contrast, were happy to apply when they thought they met just 60 percent of the requirements. This single data point from a major corporation highlights a quiet, pervasive pattern. It’s a gap in the willingness to take a risk and act—a gap rooted in confidence. This hesitation, this internal calculus of 'Am I ready yet?', plays out in countless decisions, from speaking up in a meeting to negotiating a salary or pursuing a challenging new project.

This exact pattern of hesitation and self-doubt is what journalists Katty Kay and Claire Shipman observed for years in their own careers and among the powerful women they interviewed. Covering politics and global affairs, they saw brilliant, highly qualified women consistently underestimating their own abilities, while their male counterparts often overestimated theirs. They grew increasingly frustrated watching this dynamic hold talented women back. This led them to a crucial question: was this just a collection of anecdotes, or was there a deeper, structural reason for this confidence gap? Their journalistic instincts compelled them to investigate, leading them on a journey into the latest research in genetics, neuroscience, and psychology to uncover the surprising science behind confidence and offer a tangible path for women to build it.

Module 1: The Confidence Gap—More Than Just a Feeling

Confidence is the engine of action. Kay and Shipman argue that a lack of confidence is one of the most significant, yet unacknowledged, barriers to women's advancement. It's a tangible force with real-world consequences.

The authors start by defining what confidence truly is. Confidence is the belief that turns thoughts into action. It’s the internal permission slip you write for yourself to try, to fail, and to try again. This belief is built on a few key pillars. Self-esteem, which is valuing yourself. Optimism, which is believing in good outcomes. And self-compassion, which is the ability to forgive your own mistakes. Without these, even brilliant ideas remain just ideas.

This brings us to a stark reality. The authors reveal a measurable "confidence gap" between men and women. In one powerful experiment, participants were given a spatial puzzle. Initially, women scored much lower than men. But here’s the twist. The women weren't getting the answers wrong. They were simply not attempting the questions they found difficult. When the rules changed and every question had to be answered, their scores shot up to match the men's. The difference wasn't ability. It was the confidence to take a risk. Underconfidence is what often holds women back.

And here's the thing. This gap has a compounding effect on a career. Men are more likely to ask for promotions. They are more comfortable advocating for their achievements. Women, on the other hand, often wait to be noticed. They worry that self-promotion will make them seem ungrateful or "bossy." This hesitation means fewer opportunities, slower advancement, and ultimately, lower earnings over a lifetime. It’s a pattern of behavior with deep roots.

So what's driving this? The authors point to a combination of factors. One of them is a tendency toward perfectionism. Women's brains are often wired for overthinking and rumination. While men tend to jump into tasks, women are more likely to analyze every possible outcome. They aim for 100% readiness before taking a leap. This quest for perfection becomes a cage. It leads to inaction and a fear of failure that paralyzes progress. A man might see a failure as a result of bad timing. A woman is more likely to internalize it as a personal failing, a sign she isn't good enough. This cycle erodes confidence over time.