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For a first version, you estimate a number of users as
You must choose an option
Small
Your application will be used by approximately a small number of users (less than 10 people for an internal application, less than 200 visitors per month for a public site).
Medium
Your application will be used by approximately a medium number of users (11 to 100 people for an internal application, 200 to 1,000 visitors per month for a public site).
Large
Your application will be used by a large number of users (more than 100 people for an internal application, more than 1,000 visitors per month for a public site).
No Idea
I don't have a precise idea.