IntroductionNowadays, team is widely used in organizations, because team is effective. “A team is not simply a group of people who work together or like each other or share opinions. A team is a group of people with a common goal.” (Barnes, 2001) More and more organizations tend to work in teams (Milliken and Martins, 1996). Teamwork is widely used because the coaching team is able to effectively achieve an extraordinary goal (Mitsch, 2010). This essay will describe the reasons for the effectiveness of teamwork. First, it will describe the percentages of people who want to work in a team and the reasons for choosing teamwork. Secondly, the essay will write that the team has effective tools to solve problems. Third, the essay will describe the team's effective thinking. Fourth, the essay will write about the creativity of the team. Next, the essay will describe the adverse factors that are capable of affecting the team's efficiency and will also describe the team development stage that can reduce the disadvantages of the factors. Percentage of teamwork In contemporary organizations, more and more companies tend to plan their employees to work in teams (Kocher er al, 2006). In 1995, Osterman found that 54.5% of American companies work in teams (Kocher et al, 2006). The reason for using teamwork is that it has simply proven to be beneficial to businesses (Kocher et al, 2006). In general, teamwork makes better decisions than individuals, and teams often make decisions that are accepted across larger areas. Therefore, teams have become important tools for identifying high-quality solutions to solve organizational problems (Kocher et al, 2006). Kocher et al (2006) designed a decision experiment, the beauty pageant game. They discovered about 60… half of the paper… the benefit of team creativity is not complete proof, the effectiveness of team creativity is widely recognized and accepted. Finally, the written essay can have an effect on the effectiveness of the team. However, the five stages of team development can reduce the effect of problems. Each stage has several solution areas, which include team communication and team member behavior. In this essay, team effectiveness wrote about problem solving, creativity, and making more profits. However, these are not all the positive points of the team. The team still has other functions or methods to demonstrate the effectiveness of the team. Although the team still has areas of instability, with the development of management, these destabilizing factors will gradually weaken until they disappear. In the future, the team will be more and more effective and increase profits in all types of companies.