The growing efficiency and lower prices of computers make it possible to apply them more widely in the economy. However, the wide use of computers in every day life is hindered by a number of factors which constitute what we shall call the "problem of contact" or of "talking." The difficulty is that languages used by computers differ substantially from users' languages and are not understood by specialists who are unfamiliar with programming. This is why those specialists who use computers need the help of programmers to communicate. Since this form of communication has many more or less...