Product & Analytics / Web & Product Analytics

Session Depth / Screens per Session ~ (also "pages per session", "screens per session", "session length")

How many pages, screens, or actions a user moves through in a single sitting.

The fork, why two teams get different numbers

WHAT you count per session, and WHICH sessions form the denominator.

In the Metric Library

The full fork, both definitions worked all the way through
The trap that makes the number lie, on a real export
Every formula variant, spelled out
The reconciliation anchor, what to tie it to and when to refuse

Reference: Product-analytics convention (no governing body); GA4 / web-analytics session and screen_view conventions cited as reference; MRC Invalid Traffic guidelines