Advocacy

Advocacy is a coordinated combination of problem identification, solution creation, strategy development and actions taken to make positive changes. Advocacy and activism are terms that are often used interchangeably, and while they do overlap, they also have distinctly different meanings.
An advocate is one who speaks on behalf of another person or group.
An activist is a person who makes an intentional action to bring about social or political change.

Source: NIH Pain Consortium