The number and complexity of algorithms and data structures are expanding every day and it is becoming increasingly difficult to visualize the abstractions involved in implementing and applying data structures and algorithms, which form the back-bone of almost all computer applications. Animated algorithms and data structrues enhance our understanding of abstract concepts, aid program debugging, increase programmer productivity and reduce analysis and design costs. Animation of algorithms usually involves the display of various features in multiple dynamic windows, including an animated display of the text of the algorithm in one window and a dynamically changing graphical interpretation of the algorithm in execution in another. This paper concentrates on the development of a system for animated display of Pascal programs and the definition of rules to impregnate a given algorithm with code to animate it.