How many therapists does it take to change a lightbulb?

This is a model taken from Virginia Satir's belief system, and means that whatever a person does, they are in fact attempting to fulfill some positive intention (of which they may not be aware). It assumes that the current behaviour exhibited by a person represents the best choice available to them at the time. Generating alternatives from this point of view is thought by NLP proponents to be a useful way of helping people to change unwanted or undesirable behaviours.