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The simplest answer to this question, is for the organisation to establish the processes and support framework around which the project management role would work with.
In terms of the processes this would include documentation such as project mandates, reporting processes, resource management, change process and general PMO framework (This also covers reporting and KPI's).
With regards to the support framework, this more specifically refers to technically competent consultants/employees with whom the project manager can consult with with regards to the many implementation/delivery aspects of the project and whom can help in identifying the necessary risks and issues relating to the project.
Subsequently this also includes the necessary personnel who will work to deliver the project.
Hope that helps!