One aspect that Excel almost seems to enforce for any significantly complex computation is... testing. If you don't known have test input (e.g. an array of val

One aspect that Excel almost seems to enforce for any significantly complex computation is... testing. If you don't known have test input (e.g. an array of values) for which you have known output to observe for such an opaque programming language, you will be bitten! This innovation just makes it even more important. That said Excel lets non-programmers create visual representations of data on a regular basis, and everyone has it on their desktop so there's no, "I can't use this" excuse.