title: How to draw an activity diagram for Usecase that have two actor
body: <p>I have a use-case with two actors. One actor is into the system like <code>member</code> and one other actor is out of the system like <code>bank</code> and my system has interaction with these actors. I want to draw an Activity Diagram for this use-case. I have a problem with swim-lanes of this activity diagram.</p>
  
  <p>Should I use three swim-lanes in this activity diagram? How to draw this activity diagram? </p>