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.
To Improve Community Life. One good reason why volunteering is important is that it goes a long way towards creating a healthy community. Kids who agree to take part in tidying up their classrooms and surrounding areas, promote cleanliness.This in turn helps the community to find motivation to combat pollution and trash.nother reason why volunteering is important is that it showcases someoneâs gratitude. Someone who becomes successful in selling books may take part in a reading for a childrenâs program. An athlete can spend some time in teaching others, the basics of his / her sport.