Over the past two decades there have been great advances in the understandi
ng of depression and in the development of pharmacological agents and psych
osocial treatments that have demonstrated efficacy in the treatment of this
common and disabling illness. Unfortunately, this knowledge and evidence i
s not consistently translated into actual treatment, and depression remains
undiagnosed in a large percentage of patients, and when it is accurately d
iagnosed, it often is suboptimally treated.
The frequent failure to properly diagnose depression may be due to the cont
inuing stigma of mental illness, the persistence of the biomedical, rather
than the biopsychosocial, paradigm of illness and treatment, educational is
sues and the time constraints in the typical medical practice. The suboptim
al treatment may be due to all of these issues plus the difficulty in chang
ing physician behaviours even when there: exists much evidence that would s
eem to dictate such a change. The development of a criteria-based nomenclat
ure and the subsequent development and dissemination of evidence-based prac
tice guidelines addresses some of these issues. Copyright (C) 2001 John Wil
ey & Sons, Ltd.