Why do major systems engineering projects usually require teams rather than one engineer?

Major systems engineering projects typically require a team approach because they are inherently interdisciplinary and multifaceted, making it nearly impossible for a single individual to possess all the necessary specialized qualifications.12

Systems engineering involves applying knowledge from a vast array of scientific and engineering disciplines—such as probability, statistics, computing, cybernetics, and human-factors engineering—to solve complex, large-scale problems. Because these systems are composed of interacting parts where a change in one area often affects many others, the work requires a diverse "arsenal" of research techniques and disciplinary perspectives that no one person can master alone.123

Furthermore, these projects often demand significant management responsibility, including cost analysis, scheduling, and the monitoring of high-risk testing procedures. By utilizing an interdisciplinary team, systems engineers can effectively integrate these disparate bodies of knowledge and specialized tools to achieve a prescribed goal in an efficient and reliable manner.213