Are volunteer job descriptions necessary?

Summary:

Before volunteering, be sure you understand what's expected of you in the job

The Volunteer Center of San Francisco said in Helpful Hints for Volunteers
at http://www.meer.net:80/users/taylor/volhints.htm:

ASK FOR A JOB DESCRIPTION of your volunteer work. It helps you decide if
the work is an appropriate "fit" for you, and provides a set of standards
or expectations when you do volunteer. Nothing is worse than setting aside
time to volunteer at an agency, only to arrive and find there's nothing to
do.

A job description goes a long way towards allleviating these blues.