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.
Paramount to elderly volunteer participation is the fact that volunteers age 65 and over donated the most time- a median of 96 hours- to volunteer activities (Bureau of Labor Statistics, 2002). To benchmark, a median of 34 hours a year was noted for volunteers age 25 to 34 (Bureau of Labor Statistics, 2002).