By Jeff Sauro, PhD . April 26, 2011 . Tags: Questionnaires, SUS
There is a long tradition of including items in questionnaires that are phrased both positively and negatively. This website was easy to use. It was difficult to find what I needed on this website. The major reason for alternating item wording is to minimize extreme response bias and acquiescent bias. However, some recent research[pdf] Jim Lewis and I conducted found little evidence for these biases.