The chapter will elaborate on the following propositions:

The psychiatrist needs to attend to multiple indicators of the presence of a psychotic disorder.

There are a number of clinical techniques that the clinican can use to acertain the presence of psychosis in childhood.

A number ofireliable diagnostic scales can be used to ascertain the presence and extent of psychosis.

Psychological testing is a helpful aid in the diagnosis of psychosis.

The psychiatrist may seek a neurological consultation or may request neuroimaging or other related studies.

So far, there are no def nitive studies that corroborate the presence of a serious psychotic disorder.

The identif cation and diagnosis of childhood psychosis is still preeminently a clinical exercise.

Significant progress is being made in many fields (genetics, electrophysiology, biochemistry, imaging, and others) to identify diagnostic underpinnings of chronic psychosis.