31 ;;Quote: immediate computation--an edited datum is automatically processed; e.g., formatting in word processors and background recalc in spreadsheets

31 ;;Quote: with immediate computation, a computation is always consistent with the current state of the data; provides feedback

35 ;;Quote: selective recomputation by comparing old and new values; when the same, stop propagation of the change

35 ;;Quote: in differential evaluation recompute a function by computing the difference from a previous value

38 ;;Quote: attribute grammars automatically handle the repropagation of consistent attribute values after an editing change

39 ;;Quote: the problem with attribute grammars for language-based editors and immediate computation is their inefficient visits to every node