What should they know or do when they find out about the assignment/project?
Communication objectives are formulated on the basis of the effect you want to achieve with your communication and your messages.
Knowledge? What do you want the target group to find out, know or become familiar with?
Change in attitude? What do you want the target group to get an understanding of, accept, or become very positive about?
Motivation? What do you want the target group to become motivated to try out?
Action? What do you want the target group to do?
Be realistic in relation to the schedule and budget of the assignment/project and focus on the very important and important target groups. Sometimes it is a good idea to interview a few people from some of your target groups in order to set realistic objectives that can be evaluated.
What effect do I want to achieve in the very important and important target groups? Knowledge, attitude, motivation, or action?