S1 · L072:33
The Cobra Problem
Measure what changes decisions, align on a North Star, respect retention, and never reward a number without a guardrail.
Metrics
Glossary
Retention
The share of users who keep coming back over time. Acquisition shows how good your marketing is; retention shows how good your product is. A curve that flattens means people found real value.
Learn it in a lesson
S1 · L082:30The Game That Became Slack
Product-market fit is pull, not push: watch retention, ask the disappointment question, and listen when people complain.
Growth
S2 · L012:18The Magic Number
Find the moment your product clicks, measure how fast people reach it, and clear every obstacle on the road.
Growth
S2 · L032:01The Product That Sold Itself
Make value fast, make sharing natural, and let the product earn its own customers: reward both sides when people invite a friend.
Growth
S2 · L101:49The Missing Bullet Holes
The data you can see is not the whole story: seek out the users who left, the deals you lost, and the voices that went quiet.
Metrics
S2 · L112:04The Shopkeeper's Scale
Keep an honest scale: short-term tricks borrow from long-term trust, and the interest is always higher than you think.
Design