With increasing focus on the mental health of young people by schools, greater attention is directed to the responsiveness and effectiveness of models of psychological practice in schools. A model will be presented with a coherent theoretical structure within which the school counsellor can understand the diverse psychological symptoms and problems of the school students and professionally deliver counselling services to effectively meet these needs. The model, developed from personal construct theory and psychology, is framed around a set of principles which are outlined through the propositions of the model while the counselling processes are operationalised through the strategies. (Contains 2 tables.)