If your activity involves large numbers and the follow up list is long, analyze ways to segment it to make the contact feel more personal. For example, if it's a big event and people are seated at specific tables, mentioning the names of one or two others at their table would make a strong impact. If the meeting is only three or four people, reference to a point made by one participant could be important.
Good follow up involves your internal procedures as well. Notes to a file about information learned, issues raised or concerns discussed need to be maintained since future staff members will need to have the personal history. This is especially important when volunteers have made visits. I don't like to make volunteers fill out forms or write reports, so a quick phone conversation initiated by someone on staff can handle the communication easily.
Building strong relationships comes from good follow up, as it indicated competence and builds trust. Don't waste your efforts by ignoring this important step, no matter how simple it may be.
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