system 2 has some ability to change the way system 1 works, by programming the normally automatic functions of attention and memory. when waiting for a relative at a busy train station, for example, you can set yourself at will to look for a white-haired woman or a bearded man, and thereby increase the likelihood of detecting your relative from a distance. you can set your memory to search for capital cities that start with N or for French existentialist novels. and when you rent a car at London's Heathrow Airport, the attendant will probably remind you that we drive on the left side of the road over here. in all these cases, you are asked to do something that does not come naturally, and you will find that the consistent maintenance of a set requires continuous exertion of at least some effort.
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