Object‐oriented programming has been applied to the development of a prototype workstation to be used in airport traffic control towers. Objective‐C was used because it supports objects, classes and inheritance, and it allows easy access to system services. A number of design practices emerged as helpful in the course of development, some of which have been reported elsewhere. The notion of a framework of co‐operating classes as a paradigm of design was especially helpful. Comparisons with the size and rate of code production of an earlier, similar workstation programmed in C indicate an advantage to object‐oriented programming. Copyright © 1990 John Wiley & Sons, Ltd
