There are four basic personality types described by color: red, blue, green, and yellow. The red personality is dominating and demands things be done their way immediately. Blues are perfectionists who examine all details. Greens are calm and don't get annoyed easily. Yellows are sunny and seek friends when stressed. Each type has strengths like optimism or discipline, and weaknesses like overcommitting or avoiding controversy. Motivating each type requires different approaches, like telling stories for reds or providing options instead of opinions for yellows.