Poor team performance is a major concern because most of the work performed today is done in a team environment — research teams, product development teams, production teams, sales and marketing teams, cross - functional problem - solving teams, and top management teams. One reason that work is done more by teams now is that products and services have become increasingly complex, requiring a wide range of skills and technologies.No single person is capable of developing, manufacturing, and selling increasingly complex products, which means that teams of individuals with complementary knowledge must coordinate effectively in order to be successful. This requires teamwork.