title: In JMeter, where is the best place to define variable?
body: <p>In JMeter, I have added a Config Element of User Defined Variables to state my variable data. However, I see I can do the same thing up in the main Test Plan element.</p>
  
  <p>When should you define your variables within the Test Plan and when should you define them within the Config Element? What's the pro/con of each?</p>
  
  <p>Thanks.</p>