[Qualitative and quantitative examination of bacteria found in aquatic habitats. 3. Communications: Recording the data for identification and analysing by numerical methods (author's transl)].

A sheet for optical page mark was developed to transfer the large amount of identification criteria, necessary for quantitative and qualitative determination of bacterial populations, to the computer-assisted analysis. Empirical and numerical methods are used for the taxonomic evaluation. Different metrics are applied to the different groups of criteria. The clusters were formed by the single-linkage method. An example is given to explain how cluster analysis and formal descriptions are an useful aid for the classification of bacteria.