title: need for creating partitions in an activity diagram
body: <p>i am sorry for asking such a straight forward and simple question but there is a lot of confusion regarding the use of partition in activity diagrams like :</p>
  
  <blockquote>
    <ol>
    <li>is it really necessary to create partitions?</li>
    <li>since each organisation has a number of working units/sub-units,and eventually they will have roles to play,would we
    need to create partitions in literally every activity diagram we draw
    for any process flow?</li>
    </ol>
  </blockquote>
  
  <p>e.g- suppose we have draw an activity diagram for online shopping .customers browse and search for items and later buy it .now there are very fewer roles here so we can clearly draw the diagram without partitions but still we can create them ,in both case they will represent the system so does it really make sense to create them.</p>