The 5 steps of the size up process are, 1. Determining facts when the call is received, how is the weather going to affect this operation, what type of incident is it? 2. Anticipating possibilities of what is to come, what could happen to jeopardize this mission? 3. Assessing your own situation and figuring out what resources you have or may be missing 4. Making decisions, using all the facts available to determine objectives, strategies, and tactics 5. Planning the operation, putting tactics into motion, communicating with units on scene