Clarifying who is responsible for what will prevent strained relationships between volunteers and staff. Having a clear statement of the job's purpose assures that the volunteer will be used effectively. It also eliminates misunderstandings that can result when volunteers don't understand the limits of their role. Being unclear about job qualifications will result in misplaced volunteers who will fail in the tasks. Describe the training you will provide for the job.
Training also ensures that volunteers are able to do the job well and be successful.