“…Such questions are given for a holistic view as well as for more specific aspects. A number of publications have been issued on these questions, like (Ramaswami, 1995) and (Pandya, 1994) for overall descriptions. Response times and related performance issues for querying data bases and personal communications have also been treated in papers, like (Demounem, 1992), (Saito, 1994), (Kwiatkowski, 1995).…”