Parallel to pharmacological treatments, there has been a steady research in psychological interventions for schizophrenia. Current interventions had a more biologic understanding of the disorder and adopted a diathesis-stress model to explain symptoms and course, incorporating adaptation and adjustment through learned and practiced coping strategies. There are many psychological treatments for schizophrenia, although all are considered roughly equivalent, empirical data shows slight differences in efficacy; in particular, Cognitive Behavioural Therapy (CBT) yields small to medium sized effects in addition to psychopharmacological treatment.