Question
“DAU dropped 10% last week. Where do you look first?”
Weak answer
I would check if there was a bug, then look at our marketing campaigns to see if we stopped any ads. If acquisition is down we should probably run a promo to bring users back and boost the numbers again.
Strong answer
I would split the 10% across the funnel before touching a lever. Acquisition: are new sign-ups down, and is it one channel or all of them? Activation: of the users who did sign up, is the aha-moment rate stable? Retention: pull the cohort curves, because a 10% DAU drop with flat sign-ups means last month’s cohort stopped returning, and that is a retention story wearing an acquisition costume. Referral and Revenue I would park, since neither moves DAU inside a week. My first look is the retention curve by cohort, because it is the only stage where a change last month surfaces as a drop this week.
Why the strong version wins: The strong answer diagnoses which stage broke before proposing anything, and rules out the stages that cannot explain the timing. The weak answer reaches for a promo, which is the classic AARRR failure: optimizing acquisition when retention is the leak.