The document discusses the complexity of teamwork in practice compared to theory. It presents Tuckman's model of team development, which outlines the stages of forming, storming, norming, performing, and adjourning. However, the reality of each stage is more challenging than the theory. For example, in the forming stage there are actual biases in team selection and unclear objectives rather than just getting to know each other. The document also lists reasons why teams can fail, such as dominant personalities, lack of critical thinking, and personal attacks between members.