Glossary Term: Dichotomous Keys

(Synonymous with Single Access Key)

A key where the sequence and structure of identification steps is fixed by the author of the key. At each point in the decision process, multiple alternatives are offered, each leading to a result or a further choice. The alternatives are commonly called “leads”, and the set of leads at a given point a “couplet”. If the key has several choices it is described as polychotomous or polytomous. If the entire key consists of exactly two choices at each branching point, the key is called dichotomous. The majority of single-access keys are dichotomous.

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Created: 2019-06-23 12:12:26 PDT (-0700)
Last modified: 2019-08-19 02:45:48 PDT (-0700)