WwW evidence-based design? Jorge Frascara DESIGN HAS MOVED on fuzzy grounds for a long time. Decisions have followed best practices, opinion leaders, “good taste,” aesthetic fads, and personal assumptions about what works and what doesn't. Since the times of William Morris, through the Bauhaus times, well into the xx Century, and even today, many designers worked all their lives on those grounds because research and evaluation were not part of design culture. They have existed in the culture of colour since the 1700s, and in the legibility of print since the first studies by Tinker in 1925. It took hold in advertising in the 1950s: if the product you were announcing in your smart looking campaign did not sell, your agency lost the account. But if you were designing a leaflet for a pharmaceutical product, as long as all the information that the law required was there, you were good. 23