The psychodynamic model of abnormality, established by Sigmund Freud, posits that mental disorders stem from unconscious motivations and unresolved conflicts from childhood. Freud's theory includes the interaction of the id, ego, and super-ego, and emphasizes the importance of making unconscious thoughts conscious to resolve psychological issues through methods like free association and dream analysis. Despite its influence, the model has faced criticism for its focus on the past, lack of empirical evidence, and applicability to diverse populations.