This dissertation examines the use of the Integral Intake idiographic assessment methodology in psychotherapeutic practice. Against the background of the history and theoretical foundations of Integral Psychotherapy, this assessment method is outlined and its use in psychotherapeutic practice will be critically evaluated. While many clinicians do not use a formal instrument to support assessment, the Integral Intake, although it may “go against the grain” in some respects and may be perceived as long and complex, is evaluated positively as a preferred idiographic assessment instrument. However, notwithstanding the instrument being used, successful assessment and intervention depends ultimately on the assessor, the psychotherapist. The dissertation raises questions about stage of development of trainee and trained therapists in the psychotherapy profession.