Context: waiting for <something to happen>
 

I'm sure others have employed this, but it just came across to me that when I have actions that are dependent on something to happen, and that something has no predictable start or due date, and is not dependent on any person to do something, that I create a waiting for like:

WF: New hire
WF: Staff leaves employ

I have certain actions that need to take place whenever someone is hired, or leaves employ.

Bob