In this paper reference will be made consistently to constructive typology. In order to avoid confusion—to use McKinney's words— "the term 'constructed' type is used here in preference to the designations 'ideal' and 'pure' types. The terms ideal and pure have been misinterpreted so frequently that it seems advisable to follow Howard Becker's usage and refer to these types as 'constructed types. [ABSTRACT FROM AUTHOR]