Abstract: This invention features a method of delivering information over one or more information delivery networks, the method including: monitoring the actions of a user on the one or more networks to obtain observed user data relating to a desired behavior modification; obtaining user supplied data relating to the desired behavior modification; evaluating the observed user data and the use supplied data to generate tailored information for progressing a user towards the desired behavior modification; presenting the tailored information to the user over at least one of the networks; and repeating steps a), b), c) and d) until the desired behavior modification is achieved. The user is continually provided with re-tailored information resulting from an iterative process of obtaining and evaluating data that progresses the user towards a desired behavior modification. The desired behavior modification can be, for example, the cessation of smoking.