Answer: The process by which Dr. Blakely is putting together a set of integrated factors to explain Stephen's disturbance is: Clinical Picture.
Explanation: A clinical picture is all of the details and particulars that relates to a patient state. As the name says, a clinical picture is a picture or an integration of multiple factors that are causing and mantaining disturbances to the patient.
In this case, Dr. Blakely is constructing a clinical picture, but since he is a behavioral psychologist, his clinical picture is certainly influenced by the behavioral theory.
In conclusion, Dr. Blakely is putting together a clinical picture because he is integrating all of the details and factors that are causing disturbances to the patient.