Describe in detail what you did that led up to the failure. Outline specifically the steps and actions you took leading up to the failure. 
Tell me what happened and then what did you expect to happen in the situation.
Make sure to outline exactly where things went wrong and what failed?
Reflect on why you failed, what could have been done differently and how you felt when you failed?
Outline how you could have changed the events or course of action. 
Explain in detail how this failure helped you grow. What did you learn from this failure?