The document discusses how to select target audiences and segment groups for communication. It explains that the first step is to identify the stakeholder group that most influences the problem, such as consumers, journalists, or employees. The next steps are to analyze roles and opinion leaders within that group, and determine who needs to influence whom to achieve the desired effect. Then the specific communication target group is chosen and their characteristics are researched to allow segmentation into homogeneous subgroups that can be targeted effectively.