Feelings are complicated. They come in different sizes, intensities, and levels of energy that are unique within our brains and bodies. To make them easier to talk about, think about, and regulate, The Zones of Regulation organizes our feelings, states of alertness, and energy levels into four colored Zones – Blue, Green, Yellow, and Red. The simple, common language and visual structure of The Zones of Regulation helps make the complex skill of regulation more concrete for learners and those who support them. We learn to regulate our Zones to meet our goals and task demands, as well as support our overall well-being.
(http://zonesofregulation.com/how-it-works/)