This document discusses behavioral design and provides tools to incorporate it. It explains that behavioral design draws on behavioral psychology to increase user engagement, reduce cognitive load, and influence choices by leveraging habits, cognitive biases, and cognitive load. Specific tools are presented, such as habit hijacking to build new habits onto existing ones, friction analysis to reduce barriers, and cognitive load mapping to simplify experiences. Examples demonstrate how these techniques can be combined, like a banking interface that hijacks the checking balance habit using loss aversion and glanceable information design.