My opinion if we want to make our project successfully we needs some factors for example like this :
There are five factors to make our project become be successfully.
1.Intelligent People
   If we want to make a project a success, We need capable people in our team. A project can derail at any point of time and we must work hard.
2.Comprehensive Planning
   We must create good planning to do the project. There are many benefits of smart planning. This starting step in the project allows a realistic
   time frame to be created. It gives accurate time for cost estimations to be produced and also helps in clear documentation of milestones and
   deliverables, which will make things much easier as the project progresses.
3. Open Communication
    We have open communication in a team because an open communication channel is very important in a project for it to be a success.
    When the team is working on a specific schedule and we can communicate the others well to do the project.
4.Proper Risk Management
   It is a known fact that projects do not go exactly as planned. Some projects fail and some fail spectacularly due to risks that arise during
   a project. So we must do the project carefully.
5.Strong Project Closure
   It is importance  for a project to have a strong closure. As a project manager you should be firm and agree with the client that all the critical
   success factors have been met. Project delivery, testing and release confirmation must be agreed upon and signed off.