For decades the story we told about women and work had one villain: the glass ceiling. The image was of women rising steadily through their careers until, somewhere near the top, they hit an invisible barrier that kept them out of the boardroom and the corner office. It is a powerful picture, and it is also, increasingly, the wrong one. The most important research on women in the workplace over the last several years points somewhere far less glamorous and far more fixable. The problem is not at the top. It is at the very first step up.
The concept is called the "broken rung," and it comes from the long-running Women in the Workplace study conducted by McKinsey together with LeanIn.Org — the largest of its kind on the state of women in corporate roles. The finding that reframed the debate is this: the single biggest drop-off for women is not the leap to the executive suite. It is the first promotion from individual contributor to manager. For every cohort of men promoted to that first management rung, fewer women make the same step. And because that first promotion is the gateway to every promotion that follows, a shortfall there cascades all the way up.
Why the first rung matters more than the ceiling
Think about what the first management promotion actually is. It is the moment a worker stops being judged purely on their own output and starts being trusted to direct others. It is the entry ticket to the pipeline that eventually produces directors, vice presidents and chief executives. If fewer women pass through that gate at the start, then a decade later there are simply fewer women in the pool from which senior leaders are chosen — not because they hit a ceiling near the top, but because too few of them were ever let onto the escalator.
This is why the glass-ceiling framing has quietly misled a generation of well-meaning effort. Companies poured resources into senior-leadership initiatives, board quotas and executive sponsorship programmes — all aimed at the top of the funnel. Worthwhile, but treating the symptom. If the entry point to management is where women fall behind, the most expensive interventions at the top are trying to fill a tank with a hole near the bottom.
What actually happens at that first step
The mechanics of the broken rung are not dramatic. There is rarely a moment of overt discrimination anyone could point to. Instead it is an accumulation of small, deniable things. Managers, mostly without malice, tend to promote in their own image, and most existing managers are men. The confident self-promoter — statistically more often a man — gets read as "leadership material," while the woman doing equivalent work quietly is overlooked because she did not announce herself. Women are more likely to be promoted on a demonstrated track record and men on perceived potential, which means a man can be elevated for what he might do while a woman waits to prove what she already has.
There is a documented "prove-it-again" pattern, where women are asked to demonstrate competence repeatedly that a male peer establishes once. None of these is a locked door. Each is a slightly heavier door, and the cumulative weight at that first promotion is enough to thin the numbers measurably.
What the research suggests actually helps
- Tracking promotion rates by gender at every level, especially the first step into management, rather than only counting women at the top — you cannot fix a leak you are not measuring.
- Setting clear, written criteria for what earns a promotion, so decisions rest on standards rather than on who lobbied hardest.
- Promoting on potential consistently, or on track record consistently — the damage comes from applying different standards to different people.
- Training the managers who make these calls to notice the quiet high performer, not just the loud one.
The part workers can use, not just companies
Most coverage of the broken rung addresses employers, which is right — the responsibility for fixing a systemic pattern sits with the system. But there is something here for individuals navigating it too, even while the structures are slow to change. If promotions in your organisation go disproportionately to those who make their work visible, then doing excellent work quietly and waiting to be noticed is, however unfair, a losing strategy. The advice to "just do great work and it will be recognised" is comforting and frequently wrong.
That does not mean becoming the loudest person in the room. It means making sure the people who decide promotions actually know what you have delivered — a brief, factual update to your manager, a willingness to say what you want next rather than hoping it is inferred, an early conversation about the path to management rather than a passive wait for a tap on the shoulder. It is asymmetric and it should not be necessary. While the system catches up, it is also realistic.
A note of honest caution
It would be neat to end by declaring the glass ceiling a myth and the broken rung the whole truth. That would be overcorrecting. The barriers near the top are real, particularly for women of colour, who face the steepest version of the broken rung at the very first step and compounding obstacles at every one after. The point is not that the ceiling does not exist. It is that obsessing over the ceiling while ignoring the first rung is like worrying about the roof of a house whose foundation is cracked.
The genuinely hopeful thing about the broken-rung finding is that the first management promotion is a far more tractable problem than the boardroom. It involves more decisions, made by more people, more frequently, which means more chances to get it right and faster feedback when you do. Fix who gets that first promotion, sustain it for a decade, and the pipeline downstream fills on its own. The ceiling was always the wrong place to be looking. The work, it turns out, starts much closer to the ground.