Thomas Erikson’s book sorts human behavior into four types, labeled red, yellow, green and blue. Each type has its own way of thinking, deciding and communicating. Erikson uses everyday examples from work and family life to show why people misunderstand each other. He then gives practical advice for adapting how you communicate so that you work better with people unlike you. It was first published in Swedish in 2014 as ‘Omgiven av idioter’.