Cognitive neuropsychology is already radically influencing the clinical practice of aphasia assessment and therapy. It has made it possible to analyse individuals' language disorders through a psycholinguistic model and to quantify and evaluate the effects of intervention. The complementary methods of conversation analysis are also being introduced into assessment, with the potential for bringing a further structured approach to intervention.

Ruth Lesser and Lisa Perkins are the authors of Cognitive Neuropsychology and and Conversion Analysis in Aphasia - An Introductory Casebook, published by Wiley.