A well designed high complexity spreadsheets are pretty easy to tell what's going on. The problem is most people don't put thought into how they design their s

A well designed high complexity spreadsheets are pretty easy to tell what's going on. The problem is most people don't put thought into how they design their spreadsheets. That's not their fault because there are very few resources that teach people how to design a complex spreadsheet well. If you have not seen a spreadsheet with say dedicated data input tabs, calculation tabs where you can see and audit the work being done, output tabs, revision notes, summary sheet you haven't seen a good spreadsheet.