In Barnard and Teasdale's (1991) model, mental health is related to an individual's ability to disengage from one mode or to easily move among the modes of mind. Individuals who are able to flexibly move between the modes of mind based on conditions in the environment are in the most favorable state. The ICS model theorizes that the "being" mode is the most likely mode of mind that will lead to lasting emotional changes. Therefore, to prevent relapse in depression, cognitive therapy must promote this mode. This led Teasdale to the creation of MBCT, which promotes the "being" mode.