When are acceptance tests typically written for a user story?

In eXtreme Programming (XP), analysis, design, coding, and testing phases are done:

Agile Earned Value Management (EVM) would be a valuable technique for managing a project because the:

Since the last iteration, the team has grown from six members to 14 members.
As a result, in the current iteration, the team room is crowded and uncomfortable during the team's daily standup.
It takes the team longer than the ideal amount of time to complete their standup, which creates problems for the team's current schedule.
Based on this information, the project manager should:

On a project using eXtreme Programming (XP), a customer test is a: