Thank you! I agree with you! I will try to visualize it more clearly in a table: (what I understood from both you and CommonExpress3092) |Functional requirements|Non-functional requirements| |:-|:-| |**From sid401**: Apply interventions that target the misfirings in the brain (Broca's and Wernicke's, I think), such as, training, conditioning or prescriptions |Applying interventions that target the speech muscles | |**From CommonExpress3092**: ? (He did not mention it)|Applying interventions that target motor problems (however, they are merely symptoms and do not address the problem) |