A signal or message displayed in the ambient environment such as on a wall or street where all passers-by can see it.

Color systems that signal good or bad performance instantly.

A mechanism that causes someone to make a verbal or written promise to another person to complete an action.

A system that measures the environmental impact of an action and displays it with continuous feedback to the actor.

When a group collectively works together towards a shared goal to help maintain persistent motivation.

Applying a specific start and end date for a behavior increases people's propensity to commit to the action.

A mechanism for tracking progress towards a goal that brings attention to, and rewards progress.