Enumerate the term - pathognomic sign
A comprehensive assessment ideally uses all four approaches. Some forms of specialised assessment rely heavily on pathognomic signs, behaviours that are almost exclusively seen in brain damaged patient and that have some specific, often localising significance. Other forms of specialised evaluations rarely use the general level of performance approach, which is generally reflected in some kind of summary index of impairment based on tests of varying domains and modalities. While all these approaches are important, relative emphases on any of them may relate to setting in which one practises and the clinical characteristics of the clientele in that practice. In the light of contemporary patterns of health care provision, the distinction between being in a primary care, "first-line" setting and a specialised tertiary care practise is very important.