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In biology or medicine, a multi-access key is an identification key which overcomes the problem of the more traditional single-access keys (dichotomous or polytomous identification keys) of requiring a fixed sequence of identification steps. A multi-access key enables the user to freely choose the set and characteristics that are convenient to evaluate for the item to be identified.〔Pankhurst, R. J. 1991. Practical Taxonomic Computing.〕〔Winston, J. 1999. Describing Species. Columbia University Press.〕 Although good single-access keys will try to start with characters that are reliable, convenient to observe and generally available throughout most of the year, it is often impossible to achieve this for all taxa in a key. A multi-access key lets the user adapt the key to the particular organism that is being identified and to the circumstances of identification (e.g. field or laboratory). Multi-access keys may be printed in various way (tabular, matrix, formula style, etc.) but are more commonly used as computer-aided, interactive keys. ==Alternative terms== Alternative terms used for multi-access keys are "random-access key", "multi-entry key", polyclave, "matrix key", "tabular key", "synoptic key". Some of these terms should be avoided in this sense, however: * True "multi-entry keys" exist. * The terms "tabular key" and "matrix key" are best limited to a tabular presentation format of multi-access keys.〔Fig. 19.6 in Winston, J. 1999. Describing Species. Columbia University Press.〕 * The term "synoptic key" has an older definition, defining it as a key reflecting taxonomic classification and opposed to diagnostic keys arranged solely for the convenience of identification.〔Pankhurst, R. J. 1992. Practical Taxonomic Computing.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Multi-access key」の詳細全文を読む スポンサード リンク
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