Sentence:  Dr Esterson's next book, The Leaves of Spring - a Study in the Dialectics of Madness, is an illuminating <WSD>idiographic</WSD> study, devoted for the major part to the painstaking, detailed study of a patient and her family, investigated and treated as the interacting elements of a unity. 
Meaning of the word marked with <WSD> tags:  of or pertaining to individuals.