The idea that several levels of explanations are necessary to explain behaviour ranging from the more reductionist to more holistic
Examples of looking at different levels of explanations in order to understand an area of psychology
Schizophrenia -> Diathesis-stress model (genetics & environment) Brain plasticity (experience changes or adopts the brain)
Interactionist summary

Tries to understand behaviour from each of the different levels of explanations so provides the most complete picture. Support with: Diathesis stress model Epi-geneticsBrain plasticity
