Abstract
This paper offers clinicians a succinct psycho-education model of emotion which integrates concepts of euthymia and mood disorder. The Quaternary Affectivity Model (QAM) draws from aspects of colour theory and concepts derived from well established autonomic neural system theory. Theoretical challenges associated with formulating Affectivity hypotheses and models are discussed with particular reference given to those models which generate useful and testable constructs for Affectivity research. Clinical anecdotes will be discussed to highlight the frequently encountered obstacles and opportunities which arise in association with offering patients this QAM and associated mood tools. Opportunities for application of QAM and the mood tools are discussed in terms of measuring empathy, monitoring mood response and setting mood goals.