1 Associations. 2  Associations between actors and use cases are indicated in use case diagrams by solid lines. 3  An association exists whenever an actor is involved with an interaction described by a use case.
Benefits of Volunteering. Volunteering supports the Exploratorium and promotes hands-on science, artistic expression, and educational innovation. Volunteers contribute to the community while gaining additional experience and new skills. They get to know each other at gatherings and special events and by sharing their ideas and experiences via an e-mail list.
Volunteering is also beneficial to a personâs mental health. By being a volunteer, you increase your self-confidence, self-esteem, and even develop a more positive outlook on life. Because you are doing something good for the community, you feel a sense of accomplishment and take pride in what youâve done.