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While cognitive biases can motivate the goal of the design effort, they do little in guiding the designer in how to solve the problem. the how (ie, what exact mechanism did the nudge employ to incur behavior change?). All in all, we found 23 distinct mechanisms of nudging, grouped in six categories and leveraging 15 different cognitive biases. The six overall categories of nudging mechanisms are:• Facilitate: nudges that reduce the (physical or mental) effort required for an activity, in order to motivate people to pursue it. Mechanisms: default options, opt-out policies, positioning, hiding, suggesting alternatives.