CRANV2 Test Environment chapter Cyril Cleverdon Michael Keen Cranfield An investigation supported by a grant to Aslib by the National Science Foundation. Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. - 5 - ENVIRONMENTAL FACTORS SUBJECT FIELD; precision of terminology, overlap of terminology with other fields. COLLECTION SIZE; Number of recognisable subject fields. QUESTIONS ASKED; Broad survey, specific request, etc. RELEVANCE NEEDS; graded decisions. SOFTWARE FACTORS CONCEPT INDEXING; level of exhaustivity. INDEX LANGUAGE; hospitality for specificity and provision of devices. SEARCH STRATEGY; flexibility to vary exhaustivity and specificity. OPERATIONAL FACTORS SUBJECT COVERAGE TIME; indexing and searching. EFFORT; intellectual and physical. PERSONNEL; indexers and searchers, CLERICAL ROUTINES RETRIEVAL PERFORMANCE qualifications and performance. HARDWARE FACTORS TYPE OF STORE INPUT EXPANSION CAPACITY E PDATING ABILITY PHYSICAL FORM OF OUTPUT FIGURE 2.1 MAIN FACTORS IN AN INFORMATION RETRIEVAL SYSTEM