Week 2 Discussion Boards. The biopsychosocial model of mental illness suggests that symptoms tend to develop in response to a combination of biological factors, social stressors and psychological stressors. Develop a list of two precipitating factors or events for each of three elements of the model (bio, psycho, and social) in explaining the onset of anxiety. Be sure to explain how they relate to the three elements. Next, comment on at least two of your peers’ lists with a prediction for when one of their precipitating events would lead to anxiety attack.