title: How often should applications be stress or load tested?
body: <p>Is there a rule on how often an application should be stress or load tested?  I normally do it before putting into production a new version, when the hardware changes or when the expected amount of users is known to change.</p>
  
  <p>But today i'm asked if this should be a standard practice for an application that is in production even if no changes are introduced.  If so, how often?</p>