Помимо некоторых небольших правок в этой публикации добавилось два абзаца относительно предыдущей версии текста.

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Just as important as addition of features were deletions (with respect to Algol). As C.A.R. Hoare once remarked: A language is characterized not only by what it permits programmers to specify, but even more so by what it does not allow. In this vein, Algol's name parameter was omitted. It was rarely used, and caused considerable complications for a compiler. Also, Algol's own concept was deleted, which allowed local variables to be global, to "survive" the activation of the procedure to which it was declared local. Algol's for statement was drastically simplified, eliminating complex and hard to understand constructs. But the while and repeat statements were added for simple and transparent situations of repetition. Nevertheless, the controversial goto statement remained. I considered it too early for the programming community to swallow its absense. It would have been too detrimental for a general acceptance of Pascal.

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The principal purpose of a higher-level language is to raise the level of abstraction from that of machine instructions. Examples are data structures vs. word arrays in memory, or conditional and repetitive statements vs. jump instructions. A perfect language should be defined in terms of mathematical logic, of axioms and rules of inference. No reference to any computer or mechanism should be necessary to understand it. This is the basis of portability. Algol's designers saw this goal; but it is most difficult to achieve without sacrificing power of expression. Yet, any new language must be measured on the degree to which it comes close to this goal. The sequence Pascal—Modula—Oberon is witness to my attempts to achieve it. Oberon is close to it. Yet, nothing is perfect.