Abstract
The selection of characterization tests for a numerical taxonomy (NT) study presents the novice, and on occasion even the more experienced, numerical taxonomist with a dilemma. Basic studies are needed into the mechanisms of many of the tests in use to provide an understanding of the reasons for the variability recorded for some strains or species. Some simple measures may be immediately adopted to address the reproducibility problem. In any case, the overall objective must be to improve inter laboratory reproducibility, thus enabling collective analysis of data from different NT studies—that is, the so-called “interlocking NT” approach. The simplest and most effective way to maximize test reproducibility and minimize test error is to standardize tests and document in careful detail the methods employed.
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