The behaviour of 66 radio-ions towards 11 exchangers and 11 solutions under standardized experimental conditions has been
evaluated and classified in order to have the possibility of a rapid assessment of radiochemical separation procedures. Two
systems of utilizing the bulk of data obtained have been devised and employed. The first is based on the use of a deck of
cards similar to those used for fast retrieval of bibliographic information, in which the behaviour of ions is coded by means
of punched holes; the second is based on the treatment of the data by means of an electronic computer. The operational modes
of the two systems and examples of their practical applications are presented.