Abstract
1. This paper draws upon the ideas of many people, only some of whom are acknowledged in references. The early part of the paper includes material used in previous papers, some of which have been published.
Notes
∗ Mr B. W. Smith is Director of the Technology Research Unit in the New South Wales Ministry of Technology. This paper was presented at the 1981 AITEA National Conference.
1. This paper draws upon the ideas of many people, only some of whom are acknowledged in references. The early part of the paper includes material used in previous papers, some of which have been published.