In my evolutionary design practice, I consider removing duplication one of the three fundamental moves.1 Accordingly, I practise this move daily and trust it as a primary tactic for understanding the needs of the design. I would like to share a little example with you. We encountered this example during a session of Evolutionary Design Without* Tests. We’re adding a feature to the Point of Sale system: adding provincial sales tax to each item as the shopper purchases it. The system already ...
