the study of how functional skills (e.g., memory, language, attention, reading, planning, visual-spatial analysis, problem-solving, and so forth) change and impact daily life as a result of brain dysfunction from injury and disease;

the study of the interrelatedness of mental processes and how injury to one brain system may adversely influence the functioning of other, non-injured brain systems;

the determination of brain diagnosis based, in part, on results of objective psychological tests sensitive to brain injury or disease, compared with normative performance of non-injured individuals on the same tests;

the analysis of life-consequences of brain injury or disease and the processes by which people may recover from dysfunction and/or adapt to disabilities caused by permanent dysfunction.

the administration of objective psychological tests and related procedures that are proven sensitive to the effects of brain injury;

the selection of examination procedures that are specific for measuring functional changes due to impairment of specific cognitive domains;

the integration of statistical and observational findings, and history, that may reveal a logically consistent pattern commonly seen with specific brain disorders;

the process of tying together psychosocial history, personality, medical and physical health history, and mechanisms of brain injury in order to make sense of present mental functioning and clinical presentation;

the determination of rehabilitation needs based on the measured strengths and weaknesses in functional domains and the lifestyle of the individual.