Project Sponsor
- accepts the product of the project
- might set milestones, deliverables and due dates
- determines priorities (conflict of scope, cost and time)
- protects the project
- must have the necessary authority to accomplish the work
- leads and directs the project planning work
- is responsible for the project but not necessarily for the project resources
- Identifies assumptions, constraints, dependencies and risks
- creates the work breakdown structure including cost + effort estimates
According to PMI the Project Manager has different powers that he/she can use to get the project team to perform. The options that will help the most are
- Expert knowledge of the Project Manager
- Strong support of the project manager and/or project by management
In general it is advisable to strive for a consensus solution. It will take time and it will be challenging and stressful but produce the best long term outcome for the project. To be effective as a project manager also means to be personally effective. A very good start into this topic is Stephen R. Covey's "7 habits of highly effective people"
There are multiple motivation theories that the project manager should also be familiar with to determine what is most important for the project stakeholders at a given point in time. Good people skills are key to be successful in this area.