What would be the best method to recruit potential homeless, addicted group members

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What would be the best method to recruit potential homeless, addicted group members as well as screening and selection procedures.

What do you understand by volunteerism?
Volunteerism is a form of helping in which people actively seek out opportunities to assist others in need, make considerable and continuing commitments to provide assistance, and sustain these commitments over extended periods of time, often at considerable personal cost.