Final answer:
The diathesis-stress model posits that a strong predisposition is necessary for someone to have a psychological disorder, and this model suggests that individuals with a genetic or biological vulnerability are more likely to develop a disorder when exposed to stress or environmental factors.
Step-by-step explanation:
The diathesis-stress model proposes that a strong predisposition or diathesis is required for someone to have a psychological disorder. This model suggests that individuals with a genetic or biological vulnerability are more likely to develop a disorder when exposed to stressful life events or environmental factors.
For example, let's consider depression. According to research by Friedman and Booth-Kewley (1987) and Mykletun et al. (2007), individuals who have a diathesis for depression, such as certain personality traits like depression, anger/hostility, and anxiety, are more likely to develop the disorder when they experience significant life stressors.
Therefore, the statement 'a strong predisposition/diathesis is required for someone to have a psychological disorder' is True.