The -04 auxiliaries denote relations between concepts (particularly under -042) and processes, activities and operations in any discipline. They are applicable throughout the main tables. Where such processes etc. are already adequately denoted in a main class, that notation may be preferred. Care should be taken to distinguish between a process as a subsidiary aspect of a subject and cases where the process or activity is itself the subject, e.g. appraisal of research and methodology in the social sciences would be classed using -04, at 303.1-047.4 -- as opposed to appraisal as a management technique, denoted by a main number at 005.96