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    I'm afraid I don't understand what you meant... Commented Sep 12, 2011 at 20:28
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    @vemv: I think he means by "proper level of abstraction" that you don't end up with code that has different levels of abstraction mixed (i.e. what Kilian Foth already said). You don't want your code to handle seemingly insignificant details (e.g. the formation of all bonds in fuel) when the surrounding code is considering a more high-level view of the situation at hand (e.g. running an engine). The former clutters the latter and makes your code less easy to read and maintain as you will have to consider all levels of abstraction at once at any time. Commented Sep 12, 2011 at 22:02