Opinion: The hidden cost of bad measurement – and what to do about it

Havas president Louise Simkin on why she believes clients need to bring forward real data and how agencies need to use it better.

By Louise Simkin

Marketers have more performance data than ever, but not enough of it drives real decisions. Too much reporting is surface level. Too many optimizations chase channel metrics that look good in dashboards but don’t hold up to business results. In the end, budgets are wasted, impact is overstated and, most importantly, brands are left wondering why growth has stalled.

Now, this is not a tech problem. It’s a focus problem.

The gap between media performance and business performance is growing. One of the biggest reasons is that most agency reporting stops short of what matters. Efficiency metrics get reported and brand outcomes do not. And when agencies lack access to real client data – for instance sales, margin, contribution – they fall back on what’s easy to track. The result is a model where marketing teams are moving fast but not always in the right direction.

Fixing this starts with better foundations. Clean tagging. Aligned taxonomy. Connected first-party data. These aren’t glamorous tasks, but they are the price of clarity. Without a consistent data structure, it becomes impossible to connect media to outcomes in a way that holds up to scrutiny. These are the brilliant basics of analytics that lead to real action. That includes sharpening how we define and measure attention – not just tracking exposure but understanding the quality of engagement across platforms and placements.

Technology and data infrastructure is required, but the real shift is in our mindset. Innovation in measurement doesn’t just mean new tools; it means building faster feedback loops, treating media as a learning engine and challenging legacy KPIs. Agencies need to demand more from measurement, and clients need to share more of the business context. Reporting should not just reflect what happened; it should explain what changed, why it changed and what to do next. That means fewer standalone dashboards and more integrated views that link campaign activity to the trajectory of business metrics. It also means making space to learn, not just to report.

Some of the most effective work today is being built around commercial and revenue questions, not media inputs. What markets are underperforming? What audiences are over-converting? What creative combinations are influencing repeat purchases or lifetime value? These aren’t just marketing questions. They are business queries answered through marketing data, but only if the structure and signals are there to support them.

No amount of AI, MMM or multi-touch attribution will make up for weak fundamentals. And none of those tools matter if the metrics and insights they produce don’t shape what happens next.

Measurement is not about tracking. It’s about decision-making. And for too long, the industry has treated it as a retrospective exercise. The opportunity now is to build measurement models that are directional, dynamic and directly tied to growth. That takes shared responsibility. Clients need to bring forward real data. Agencies need to use it better. Together, both sides need to define success in business terms, not just media ones.

The most successful partnerships we’ve built at Havas are grounded in this kind of clarity. When agencies and clients align around real business outcomes, measurement becomes more than reporting, it becomes a strategic advantage. That’s the thinking behind our Converged approach, a framework that connects audience design, media delivery and business measurement in one continuous cycle. We’ve seen this in action with retail and health clients where unified reporting and smarter feedback loops led directly to stronger ROI and faster optimization. This isn’t about volume of data or sophistication of tools. It’s about discipline, focus and a shared commitment to making smarter decisions. That’s how marketing operates as a growth function, not a cost centre, and how brands move forward with purpose.

Louise Simkin is the president of Havas Media Network Canada.