Implementation of Experience into project execution makes a better manager or just project documenatation makes a perfact manager?

Very well said by Viorel Dumitrache It’s project manager who makes documentation and his experience that makes a good documentation and pushes the project to a successful completion

It seems to me quite clear that a PM that has delivered previously a similar project has already a set of skills, knowledge, procedures that may be applied and deliver proper results. Just project documentation is not enough, as this will imply that Project Management is strictly a bureaucratic activity, which, in my opinion, is not. An ideal PM knows very well the technologies and concrete field steps to carry out the project, and check them from time to time. It's, however, true, that a miss in documentation may lead to disastruous consequences, hence documentation is extremely important.

I am an Engineer turned banker financing infrastructure projects. Started career as design engineer for power plant, was paired to site in erection and commissioning of power plant, preparation of design, engineering and techno-economic feasibility reports and evaluation of projects and monitoring and control has enabled me to share this experience. I have state that project concept, evaluating market Demand and supply for long period, formulation and design and financing structure are more important. Therefore projects efficacy is determined at the dreaming board stage any flaws at this stage wd be difficult to rectify. Minor issues could be solved during construction and operation stage. All the issues could only controlled by legal documentation and therefore legal documents covenants are very important. S.Siva Kumar

Project documentation is just a very small thing in managing project , so the project manager should have firstly the enough experince to manage the project