Once the plan has been developed, it needs to be tested. How will you know whether you have omitted something if you don't test your plan? It is also vital to test the plan with all your staff so that each employee is fully aware of their responsibilities.

• Read through your plan as a group. Ask at each point whether you are recommending the correct action in the right order

• Check your telephone cascade works. Are the right people on the right numbers? Does everybody know whom he or she should contact? What would you do if the phones weren't working?

• Carry out a full rehearsal. Make sure all elements of the plan work together.