This document discusses public opinion and its role in public relations. It defines public opinion as the views expressed by most people in a public about an issue that affects them. The goal of public relations is to get people to take or not take certain actions. The document then outlines the stages in shaping public opinion: awareness, readiness to act, a triggering event, and behavior. It also discusses different types of publics and factors that influence public opinion formation like self-interest, leadership, and majority views. Measurement of public opinion is noted as unstable due to constantly changing circumstances.