So what exactly is TSI? How is it calculated? And more importantly, how can strategists use it to make smarter decisions?

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Let’s unpack it.

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Why measuring trend strength matters

Before we dive into mechanics, it’s worth asking a simple question: why measure trend strength in the first place?

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In foresight and strategy work, it's easy to fall back on intuition or hype. A flashy headline or viral chart can skew perception. But behind every successful trend-driven decision lies something more objective: a clear, evolving signal that can be tracked over time — and benchmarked against other trends.

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TSI helps you separate what’s visible from what’s meaningful.

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It quantifies the momentum of a trend within a specific context (like AI in finance or circular packaging in consumer goods), enabling more rigorous prioritization, comparison, and timing of your strategic moves.

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What Is the trend strength index (TSI)?

The Trend Strength Index is one of the core metrics calculated by Trendtracker. It reflects how strong a trend is at any given moment, based on the volume and consistency of relevant signals across global public sources.

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It’s updated continuously and computed using automated text analysis on a massive scale:

• ≈ 250 million documents in total
• 500,000 documents processed daily
• Sources include industry reports, research publications, news, blogs, consumer reviews, and more

This breadth ensures that trends are captured across their full life cycle — from weak signals to global mainstream adoption.

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How TSI is calculated (a look under the hood)

TSI is not a simple count of keyword mentions. It’s a normalized, context-specific score ranging from 0 (lowest) to 10 (highest) — computed using a sophisticated multi-step process:

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1. Contextual filtering

Let’s say you’re analyzing Artificial Intelligence in the Food & Beverage sector.

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Trendtracker begins by filtering documents to include only those relevant to Food & Beverage. Within that subset, it identifies all AI-related content.

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This step is crucial: it ensures the trend strength score reflects relevance within the context that matters to you, not in isolation.

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2. Signal extraction over time

The system then tracks how frequently the AI topic appears across these documents — organizing them into time buckets (e.g., by month or quarter).

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3. Normalization & signal cleaning

Mentions are normalized and adjusted to reduce noise and eliminate irrelevant matches. This results in a clean, reliable signal that reflects the true salience of the trend in your chosen context.

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4. Rolling averages

Depending on your view (monthly, quarterly, or yearly), Trendtracker calculates a rolling average of the trend’s strength across the past 6 or 12 months, delivering a time-specific value.

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There’s also a summary value — an average of the past 24 months — ideal for identifying longer-term resilience.

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What a high (or low) TSI really means

• A TSI close to 10 suggests the trend is frequently and consistently discussed, with growing importance in the given context. It may be well on its way to maturity.
• A TSI below 3 could indicate a nascent trend, weak signal, or a fading topic — possibly worth deprioritizing, unless you’re intentionally looking for early bets.

Importantly, TSI doesn’t just show how loud a trend is — it shows how embedded it is in domain-relevant conversations.

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This helps avoid the common trap of chasing buzzwords without business grounding.

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How to use the trend strength index in practice

The real power of TSI lies in how it supports better timing, focus, and prioritization.

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Here are three strategic applications:

1. Prioritize which Ttrends to invest In

When presented with dozens of trends, it's hard to decide where to focus. TSI provides a quantitative foundation to support those calls.

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Example: In insurance, if “AI for risk modeling” scores a 7.8 and “embedded wellness tech” scores a 3.2, you have a clear signal on what's already gaining traction — and what might need further exploration or incubation.

2. Spot timing windows

Tracking TSI over time (via Trendtracker’s time series chart) lets you see acceleration or decline. That’s useful when deciding when to act.

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A rapid upward trend may indicate that a tipping point is approaching — suggesting urgency. A plateau might signal stabilization, or that differentiation will now depend on execution rather than speed.

3. Compare trends across contexts

Because TSI is context-aware, you can see how the same trend performs in different sectors.

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For instance: “Generative AI” might score an 8.5 in tech, 5.3 in finance, and 2.1 in manufacturing. That nuance helps tailor your strategy and communication — especially when building cross-industry cases.

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What TSI is not

It’s worth noting what TSI doesn’t do:

• It’s not a prediction of future market value (though it can hint at momentum).
• It’s not sentiment analysis (volume, not tone, is measured).
• It’s not a substitute for strategic judgment — but rather a data-driven lens to enhance it.

That’s why smart teams use TSI alongside other foresight tools like scenario planning, expert panels, and proprietary research.

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A forecasting bonus

As shown in the example chart on page 3 of Trendtracker’s TSI methodology paper, some trend time series include a forecasted projection — derived from proprietary models.

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While not always available for every trend, these forecasts can be powerful for pressure-testing future bets or scenario designs, especially when building a business case for innovation investments.

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Final thoughts: a better way to track what matters

Strategic decisions often come down to imperfect signals — and imperfect timing. The Trend Strength Index helps reduce that guesswork.

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By grounding your intuition in consistent, large-scale analysis, TSI gives you the clarity to:

• Track real momentum, not just hype
• Compare apples-to-apples across sectors and trends
• Act with more confidence — or caution — when it matters most

If you’re ready to see which trends are gaining ground in your industry, Book a guided demo with our strategy experts to dive into Trendtracker’s Discover tool — and explore how TSI fits into your foresight workflow.

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