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Researchers have found that loop constructs, such as the WHILE (top tested) and REPEAT-UNTIL (bottom tested) in modern programming languages are problematic for a significant number of novice programming students[5]. In theory, any bottom tested loop can be implemented as a top tested loop. Unfortunately, the converse of this is not true, leading to some of the confusions experienced by beginners. To circumvent this and other problems, Taylor[7] advocates postponing the introduction of the REPEAT-UNTIL. Instead, he discriminates between two fundamental types of WHILE loops, designated the SENTINEL WHILE and the COUNTER WHILE, which are sufficient for the implementation of any loop. A key element of Taylor's pedagogical approach is the introduction of these concepts in the context of analogies. This approach is utilized in the exposition that follows.

WHILE loops and the analogy of the single stroke engine