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.
Reducing oneâs income reduces oneâs tax bill, so the volunteer gets the benefit of lower taxes by not making money while volunteering. This assumes one makes money by working. Most pre-retirement adult people do. However, this explanation also assumes that oneâs income is tied to the hours one works.