Zwhich allows end-users to create many
Xs to solve many
Dynamic spreadsheets were invented by Daniel Bricklin and Robert Frankston as a reaction to the frustration Bricklin felt when he had to work with the old ruled-paper versions in business school. They were surprised by the success of the idea and by the fact that most people who bought the first spreadsheet program (VisiCalc) exploited it to forecast the future rather than to account for the past. Seeking to develop a "smart editor", they had created a simulation tool.
— Alan Kay - Computer Software