Product & Business Metrics
You've set a north-star and some OKRs, so you know where you're aiming. Now you need the instruments that tell you where you actually are. Every product runs on a small set of standard numbers - how people arrive, whether they stick, what they're worth - and knowing them is what lets you join a metrics conversation instead of nodding along.
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Listen to the full Product & Business Metrics course on DesignPath
There's a catch: some of the most quoted numbers are the least useful, and they're quoted precisely because they always look good. This module covers the metrics that matter, how to spot the ones that flatter, and the money math that decides whether a bet actually pays.
The AARRR Metrics
Most products share the same underlying journey: someone finds you, tries you, comes back, tells a friend, and pays. AARRR - nicknamed "pirate metrics" by Dave McClure at 500 Startups - names those five stages so a team can measure each one and see exactly where users fall out.
The Five Stages
Acquisition:how people find you and arrive - traffic, signups, installs, and which channels bring them.
Activation:whether a new user reaches their first real value - the "aha" moment, like sending a first message or finishing setup. Not just signing up, but getting something from it.
Retention:whether they come back - the single best sign the product is genuinely useful. Measured as repeat use over days, weeks, or months.
Referral:whether users bring others - invites, shares, word of mouth.
Revenue:whether they pay, and how much - conversions to paid, average revenue per user.
Read top to bottom, it's a funnel: a wide top of arrivals narrowing to the users who activate, stay, refer, and pay.
Fix Retention Before You Pour in Traffic
The instinct is to obsess over acquisition - more traffic, more signups. But pouring water into a leaking bucket is a losing game. If new users activate and then vanish, more acquisition just means more people to lose, faster.
That's why experienced teams look at activation and retention first. A product that keeps the users it already has earns the right to scale acquisition. One that doesn't will burn money getting people who never come back.
Pro tip: When growth stalls, resist the urge to spend on more traffic first. Find the stage where the funnel leaks hardest - it's usually activation or retention - and fix that. A small lift in a middle stage beats a big spend at the top.
Adapt It to Your Product
AARRR isn't sacred scripture. The order and emphasis shift by business - a marketplace lives and dies on retention and referral, a one-off purchase cares less about repeat use, some teams reorder it to put retention before referral. Use it as a checklist of the questions every product should ask about its funnel, not a fixed law.
Where AI Helps
Prompt: "Here's my product and the data I have on each stage: [paste]. Map my numbers onto AARRR, and tell me which stage is leaking hardest and what that suggests I should look at first."
AI maps your data to the funnel and spots the worst leak; you decide the fix.It's useful for organizing scattered numbers into stages and flagging where the drop-off is steepest, but why a stage leaks - and what to do about it - takes digging into your users, which is on you.
