In Childhood stress. Edited by L. Arnold. John Wiley and Sons. Be reliable and valid. Diagnostic systems tend to mirror the period of history in which it is established.
Diagnosis is essentially a culture bound task.
Remember that history is not destiny. Think in terms of a life course model. Remember that new vulnerabilities and new strengths emerge throughout life. Remember that development is the product of a dynamic interaction between the individual and the environment. Look at in a broader sense.