Implementation of Logic

In the development of computer programs for automatic checkout and the simplification of switching networks, certain simple logical routines occur frequently. Only a few such routines are needed to cover a large number of situations. A concise list or catalog of such routines is given in this paper. The shortest and simplest of these routines are called micro-programs. Somewhat more involved routines applying one or more micro-programs are given also. The use of the micro-programs and the more involved routines in automatic checkout is discussed.