An increasing number of companies are seeing the value of having more women in leadership, and they’re proving that they can make progress on gender diversity. This is an important step in the right direction. Still, women continue to be underrepresented at every level. To change the numbers, companies need to focus where the real problem is. We often talk about the “glass ceiling” that prevents women from reaching senior leadership positions. In reality, the biggest obstacle that women face is much earlier in the pipeline, at the first step up to manager. Fixing this “broken rung” is the key to achieving parity.