General problems and efficient team features in the software development team

I. Features of efficient software development teams
I have been engaged in software development for several years and have experienced many successes and failures. I always feel that my team can do better, but the result is not what I think, in many cases, the entire team does not work as I imagined, and there are always various problems. Some problems exist only because of other problems, so I always want to find the root cause of development team optimization. Maybe, so far, I still haven't found out the true root cause. I have at least taken a step forward and realized the characteristics that an efficient development team should possess. I would like to briefly describe it here.
1. The Team has clear common goals
Facts prove that a team with clear and challenging goals is much more efficient than a team with unclear or unchallenging goals, generally, technicians are proud to complete a specific task that is challenging, in turn, the team members work more actively to get this feeling of pride, which leads to the efficiency of team development. For example, as a system designer, they clearly know when to do it, when to start, when to complete, what challenges to complete the work, how to solve these difficulties, etc. provide an important guarantee for the design of a high-quality software project, but the design of a system or the preparation of the system is vague. Code It is very dangerous and costly, so an efficient software development team has a challenging common goal.
2. Strong team cohesion
In an efficient software development team, members work together as a whole. They support, communicate with each other, and respect each other, instead of shirking responsibility, being conservative, and accusing each other, this problem often exists in some scattered development teams. Program The employee is conservative. He knows that another module needs to use a piece of program code that has been compiled but has some difficulty, and he does not want to share it with other programmers, do not want to communicate with system designers. This will cause some unmeasurable factors to the project progress.
3. A harmonious communication environment for the team
In a development team, each person assumes his/her responsibilities, for example, the requirement analyst should specify the requirement specifications, the system designer should make system outline design and detailed design, and the project manager should configure the project development environment and formulate the project plan, however, the work of everyone cannot be perfect. For example, documents in the System Overview design may have bad words in some places, which may cause misunderstandings when designing in detail, when planning, the Project Manager may ignore the existence of a certain risk and lead to too much pressure on executors. In other cases, the project manager must communicate with each other and report to the project manager, therefore, an efficient software development team has a harmonious communication environment, rather than a simple command execution type.
4. The team has a clear division of roles.
All members understand their responsibilities and what plans must be completed? Who will do it? When will it start? When will it end? In what order? What I emphasize here is that the entire team must have a core role that is the project manager. This role should have the right to prepare and modify the schedule, allocate the internal staff of the development team, assign tasks and accept the permissions, and should not have other administrative rights roles in the development team. The reason for this is that I was in a vague role appointment status, and the boss did not explicitly designate me as a project manager, but it is actually responsible for the work and responsibility of this role. This leads to a state of responsibility and no right, leading to many obstacles and failure to carry out smoothly.