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.
Many funders ask organizations to measure the economic value of volunteer time for the projects they fund. Often, organizations use a simple wage replacement calculation. Volunteer hours are multiplied by an hourly rate. And this estimates the economic value of volunteering.