Key Terms in CPM

For CPM, I have listed the following key terms:

• Free Float
  This is the total time a single activity can be delayed without delayhing the early start of any successor activities.
  
  
• Total Slack
  This is the total time an activity can be delayed without delaying project completion.
  
  
• Project Slack
  This is the total time the project can be delayed without passing the customer expected completion date.