HEART metrics, anchored on task success

HEART gives product teams five dimensions to talk about: Happiness, Engagement, Adoption, Retention, and Task Success. As a shared vocabulary it works. The trouble starts when teams treat every letter as equally important and drift toward the ones easiest to move. Engagement climbs and everyone cheers, without asking whether the extra minutes in the product are delight or struggle. Retention gets counted without asking whether people stay because the experience is good or because leaving is hard. Happiness gets surveyed while outcomes go unmeasured.

Why it matters to the business

Sentiment metrics flatter; outcome metrics predict. Bain's survey of 362 firms found 80 percent believed they delivered a superior experience while only 8 percent of their customers agreed, and happiness scores are exactly the kind of evidence that sustains the illusion. What customers actually reward is getting things done: PwC's research found nearly 80 percent of US consumers rank speed, convenience, knowledgeable help, and friendly service as what matters most.

Failed tasks are effort, and effort corrodes loyalty. Research from CEB, now Gartner, found 96 percent of customers who had high-effort experiences became more disloyal, against 9 percent after low-effort ones.

How to use it

• Run a top-tasks exercise to identify the handful of tasks that carry most customer intent, then instrument those first.
• Track task success rate and time-on-task as your anchor metrics; review them before the other letters.
• Define what healthy engagement means for your product before you celebrate more of it.
• Treat Happiness and Retention as lagging guardrails, not weekly targets.
• When two letters conflict, resolve the argument in favor of Task Success.

Where teams get it wrong

The failure mode is engagement worship. Time-in-product is the easiest HEART metric to move and the easiest to misread, because a confused customer clicking in circles looks identical to a delighted one on a dashboard. Teams optimize the number and end up quietly rewarding friction. Retention worship has a milder version of the same flaw: captivity counts the same as loyalty.

Ask your team

• What is our task success rate on the five tasks customers most come to do?
• When engagement rises, how do we tell value from struggle?
• Which HEART metric would flag a customer who is active every day but failing?

Did the customer accomplish what they came to do? Every other metric is commentary.