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Message: [QUOTE="Ken Shan, post: 1733189"] I'm not sure if I understand your notion of problem-domain levels. For instance, in a preceding example amount_due = sum(item_prices) * (1 + tax_rate) is the problem domain possibly "functions and their arguments", or is the problem domain possibly "customer billing"? If the former, would you rewrite the above expression with names in the problem domain, as in amount_due = apply(*, apply(sum, item_prices), apply(+, 1, tax_rate) or amount_due = apply(apply, *, apply(apply, sum, item_prices), apply(apply, +, 1, tax_rate)) or amount_due = apply(apply, apply, *, apply(apply, apply, sum, item_prices), apply(apply, apply, +, 1, tax_rate)) (when do I stop?)? If the latter, how would you recommend that I (re)write the code... certainly, since the use of function application is so pervasive in the above code, a human-readable name in the problem domain is in order? [/QUOTE]