Today is the day you can officially pre-order yourself an Apple Watch.

If you are weighing the decision to buy one, you might be asking yourself “what, exactly is this thing going to do?” It will no doubt be a new home for apps – very tiny apps. These apps will deliver notifications via a very small screen screen, and by vibrating your wrist. The potential hazards of badly designed wach apps could drive a person mad. So how exactly do you go about making products for the new era of smart watches?