Assertiveness Part 1: Why Every Breakthrough Leader Masters This Trait
The leadership skill that separates high performers from everyone else
Have you ever been in a situation where you share an idea in a high-level meeting, and it doesn't gain traction, but in the same or a later meeting someone else shares THE SAME idea and it gets taken up?
The truth is you probably need to work on assertiveness. It’s a language, and you can learn to speak it.
I’ve coached purists who want to let their ideas fight for themselves. Unfortunately, that’s not the world we live in. You need to speak the language - it has to be authentic and you, and communicated in a way that influences and lands.
The €50 Million Lesson
I once coached a VP of Medical Affairs at a major pharmaceutical company. Let’s call her Sarah. She’d watched three product launches underperform because the commercial team consistently overpromised to regulators whilst the clinical data suggested a more cautious approach.
Sarah knew the pattern. She had the expertise. But she stayed quiet in meetings, deferring to “commercial priorities” and avoiding conflict.
The fourth launch? Different story. Sarah had developed what I call her “Narrative of Authority” - her professional story that established why her voice mattered. When the commercial team again pushed aggressive timelines, Sarah didn’t shout them down. Instead, she said:
“Having led medical strategy for three therapeutic areas over eight years, I’ve seen this pattern before. The clinical data suggests we need an additional six months for safety monitoring, or we risk a regulatory setback that could cost us market access.”
The room listened. The timeline adjusted. The launch succeeded, generating €50 million more revenue than projected because they avoided the costly regulatory delays that had plagued previous products.
Sarah didn’t become more aggressive. She became more assertive.
The Assertiveness Research
Here’s what the data tells us about assertiveness in leadership:
The Harvard Business School Study: Researchers tracked 2,400 executives over five years. Those who scored highest on “assertive communication” metrics achieved 67% better performance outcomes and received 43% more promotions.
The Pharmaceutical Leadership Research: A 2023 study of 800 pharma leaders found that assertive leaders were three times more likely to successfully navigate regulatory challenges and twice as likely to lead successful cross-functional teams.
But here’s the crucial finding: assertiveness isn’t about volume or aggression. It’s what I define as “Confidently Expressed Clarity.”
The research shows three core components:
