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It seems like on every new project, there is a need to educate members of the project team on the difference between concurrent users and simultaneous users as it applies to load testing applications.

Concurrent = users on the system using resources.
Simultaneous = users executing the same code at the exact same time.

Concurrency has various levels. I generally it explain things this way to my clients at the initial project kickoff meeting to make sure everyone agrees with the definitions:

Application Concurrency – how Read Entire Entry