View Images Library Photos and Pictures. Exposure to potentially traumatic events puts individuals at risk for developing a variety of psychological disorders; the complexities involved in treating them are numerous and have serious repercussions. How should diagnostic criteria be defined? How can we help a client who does not present with traditional PTSD symptoms? The mechanisms of human behavior need to be understood and treatment needs to be tested before we can move beyond traditional diagnostic criteria in designing and implement Exposure to potentially traumatic events puts individuals at risk for developing a variety of psychological disorders; the complexities involved in treating them are numerous and have serious repercussions. How should diagnostic criteria be defined? How can we help a client who does not present with traditional PTSD symptoms? The mechanisms of human behavior need to be understood and treatment needs to be tested before we can move beyond traditional