A stoplight chart which shows at-a-glance critical tasks.  
 

 
  • The critical task alert stoplight chart below uses parameters set-up in the column to show at-a-glance task with a critical slip.

  • The legend of the critical stoplight chart indicates that a red stoplight associated with a task has a critical slip. From a quick viewing of the schedule a project manager would be alerted to the tasks having difficulty.