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Scoring systems represent classification systems or point systems which have been designed for making quantitative statements regarding the severity of a disease, its prognosis, and its course. Furthermore, scores may serve the purposes of assessing therapies, of quality control and of quality assurance, and of an economic evaluation of intensive care. Like all measuring methods, scores are susceptible to failures and systematic mistakes. The clinical user should be well aware of these limitations. Generally, one would recommend only using scores which have been rigorously tested for their reliability, validity, and practicability. These include, but are not limited to, the updated versions of the APACHE, the SAPS, and the MPM. Although great strides have been made concerning development, verification, and clinical applicability, scores still exhibit a level of uncertainty which precludes their use in individual patients. Frequently, it may be of benefit to combine the more general scores with one or several organ dysfunction scores to determine the extent of functional impairment of specific organs. If, however, well-trained medical personnel apply tried and tested scoring systems, intensive care units will definitely gain a lot from it.

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