Final answer:
The 'norming' stage of group development is when members start to see themselves as part of a group. A 'reference group' is used as a standard for one's own behavior. Political participation includes being part of a political party or protest, but not individual actions like phoning an official, and 'collective behavior' is shown by a spontaneous group activity like attending a speaker event.
Step-by-step explanation:
The stage of the group development process that is complete when members begin to think of themselves as part of a group is norming. This is the phase where the group begins to solidify its structure, establish common norms, and build relationships that facilitate a sense of unity and cohesion. This is contrasted with other stages like forming, which is about the group coming together; storming, where conflicts often arise as members vie for positions and differences become apparent; and performing, where the group is functioning at a high level and effectively working towards its goals.
A reference group is the one whose values, norms, and beliefs come to serve as a standard for one's own behavior, influencing how individuals evaluate themselves and how they are expected to behave. Political participation at the group level could include activities such as being part of a political party, taking part in a protest, or working for a political campaign; phoning your elected official is considered individual-level political participation. Lastly, collective behavior is exemplified by a group of people interested in hearing an author speak, which can be spontaneous, less conventional, and not as institutionalized as joining an organization or following a directive, like a class going on a field trip.