I am surprised nobody mentioned this yet but there are serious Usability and Accessibility organizations. They might have all the explanations and credentials you need. http://www.nngroup.com/articles/top-ten-web-design-mistakes-of-2002/ http://www.nngroup.com/articles/horizontal-attention-leans-left/ http://www.nngroup.com/articles/f-shaped-pattern-reading-web-content/ Other credible sources are: - Don't make me think (book) - Smashing Magazine - A list apart Hope it helps with your decision Regards Renoir Boulanger https://renoirboulanger.com/#is ~