Stakeholder Management is an important discipline that successful people use to win support from others. It helps them ensure that their projects succeed where others fail.
Stakeholder Analysis is the technique used to identify the key people who have to be won over. You then use Stakeholder Planning to build the support that helps you succeed. This resource from Mind Tools provides an approach for identifying, prioritizing, and understanding your project's stakeholders. It includes a template grid for prioritizing stakeholders.