The invention relates to a method of improving a user's well-being in an interactive system, by: querying the user to determine a user identifier profile and the user's relative levels of a number of state-related traits, and identifying traits for which said relative levels deviate significantly from optimal; wherein the improvement includes: selecting, by a server, from a group of tested motivational messages which have been effective for other users to reduce the deviation in the levels of said traits, one or more selected motivational messages; where the amount of said deviation reduction is the average of all users reduction in deviation following receipt of said selected motivational messages; and sending the selected motivational messages to the device controlled by the user; and querying the user, by sending a questionnaire from the server to said device, to determine if said deviation is reduced.