Contingency plan is a subsidiary plan. It is a plan prepared when my plan is thwarted unfortunately. You can take action against embarrassed if you make a plan when incident happens.
I divided into 3 of cases. (Bad weather / Injure team member / Break down equipment) I choose Best3 has a lot possible to occur. I make a plan weather each answer is ‘YES’ or ‘NO’ that I think.
Wikipedia : http://en.wikipedia.org/wiki/Contingency_plan
What is contingency plan : http://whatis.techtarget.com/definition/contingency-plan