This is shelter-water-fire-food, in a nut shell. Of course, first aid skills and self-protection come into play in some scenarios, but not all of them. There is one skill, however, which is often as vital as the four primary survival priorities, and this is the skill of signaling for help. This is your ticket to get home. Signal whistles, signal mirrors, signal flares, and signal fires can be used to garner attention and catch the eye of search parties and good Samaritans alike. Signaling, coupled with the four main survival priorities (and a bit of luck) can get you through some rough situations. And it never hurts to carry some survival gear either.