In clinical practice, when confronted with a suspected psychosis, it is critical that, beyond simply providing a label, the diagnosis is verified and further specified with regard to the particular psychotic structure: paranoia, schizophrenia, mania, melancholia or autism. Each psychotic structure requires a specific kind of treatment. When this is clarified, it will allow us to take up an appropriate position in the transference and it to orient ourselves in relation to treatment. One approach is to determine the status of the object a and the jouissance within the logic of the case. For example, the paranoiac situates the jouissance in the Other, the schizophrenic will struggle with the jouissance in the body and the autistic subject will have troubles with language and the Other. In the case of melancholia we see that the subject fully identifies with the object a and finally, in mania, the object a will no longer function. Clinical examples of each of these structures are provided.