Which are the most important competencies required for a project manager?

The business needs, assumptions, and constraints and the understanding of the customers' needs and high- level requirements are documented in the:

A project manager is working in an environment where requirements are not very clear and may change during the project. In addition, the project has several stakeholders and is technically complex.
Which strategies should the project manager take into account for risk management in this environment?

Which Control Stakeholder Engagement tool or technique allows the project manager to consolidate and facilitate distribution of reports?

Which conflict resolution technique produces the most lasting results?