When we read these words we realize it is the building of relationship between the organization and its publics, which is crucial to doing public relations. A two-way communication where an effort is taken by the organization to build a mutual bonding, to understand the need, adapt and resolve as per audiences.
Plan or Program : This focuses on the campaign plan and how this particular process is created.
Communication/Practice Style: The style or pattern of communication used in doing a PR activity. So here I study which method would be best to communicate a message to the audience? a one-way? two-way? etc.
Systems: Walking the tight rope. This paradigm probes the role that public relations efforts play in balancing between the organisation and the environment (more on http://lamar.colostate.edu/~pr/paradigm.pdf )