Requirements for Performance Testing – 5406

Performance tests are not the easiest kind of tests. And they become more difficult, when you haven’t requirements. And projects sometimes forgot about nonfunctional requirements.
How Performance tester can help in such situation?
In my presentation I’m presenting techniques, which I’m using – when project needs performance testing, and comes to my team when no performance requirements are specified:
• How we can learn how many users will work with the system?
• How can we know – what response times users will accept?
• What if users are located around the globe?