A convenient working scheme for the rapid preparation of an evaluated inventory of the odonata species of a given habitat ("Representative Spectrum of Odonate Species" = RSO) is outlined. The evaluation is based on 5 verifiable status/abundance classes of the taxa recorded, which are assumed to represent a set of probability classes, verifiable under defined conditions. The RSO can also be used for the characterization of an individual habitat by its odonate fauna, and for bioindication of the habitat condition as required for conservation and adequate management.