Data-driven marketing is one of those phrases that sounds obvious until you realize how many teams don’t actually practice it. W. Edwards Deming put it bluntly: “Without data, you’re just another person with an opinion”. I’ve spent years working with marketing teams across Europe and LATAM, and I can confirm how painfully accurate that is.
The “I don’t do numbers” problem
Throughout my career, I’ve met professionals with strong CVs and experience at recognizable global brands. Solid backgrounds, good instincts. But when I asked them to walk me through a business case, size a market, or interpret a performance report, the answer was often some version of: “I handle communication and branding, not Excel.”
At first, I was surprised. Then I realized it was a pattern. And the real problem wasn’t the interviews, where you can screen for it. The problem showed up inside teams, where conversations split into two parallel tracks that rarely intersected: facts on one side, opinions on the other.
What marketing without data actually looks like
Going to market without data is like fishing without knowing the weather, the species you’re targeting, or the right bait. You might catch something. Probably not much. And you’ll spend a lot of budget finding out.
The cost isn’t just wasted spend. It’s the inability to replicate what works, to scale what’s working, or to make a credible case to the CFO for next year’s budget. Campaigns that can’t be measured can’t be defended, and they can’t be improved.
The metrics that actually matter
If you want marketing to drive growth, you need to understand the numbers that connect activity to commercial output. These are the ones I come back to across every market and every channel:
- Reach and Impression Share — how much of the market you’re actually covering
- Click-Through Rate (CTR) — the first signal that your message is landing
- Customer Acquisition Cost (CAC) — what it costs to bring one customer in
- Lifetime Value (LTV) — what that customer is actually worth over time
- Return on Ad Spend (ROAS) — the commercial return on each euro invested in paid media
These aren’t just reporting metrics. They’re the foundation of planning, testing, and scaling. Without them, you’re optimizing in the dark.
Marketing exists to support sales
There’s a version of marketing that’s entirely concerned with brand perception, creative quality, and cultural resonance. That work has value. But if it doesn’t translate into acquisition, retention, and revenue, it’s hard to justify at budget time, and harder to defend when results fall short.
Marketing that doesn’t support sales isn’t underperforming. It’s missing the point entirely. Data is what connects the two: it tells you whether what you’re doing is moving the commercial needle, and it gives you the language to talk about it with the rest of the business.
The goal isn’t to turn every marketer into an analyst. It’s to make sure the people running campaigns understand what success looks like in numbers, and can have an honest conversation about it.
This post was originally published on LinkedIn.
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