I would like to add a person to one card that is specific to the work she and I are doing together, but she is outside my agency so do not need her to see my entire board. -only one card that involves her.
With Trello, permissions are board specific. At this time, Trello is not able to offer card specific permissions. This is a feature request that has been received, so hopefully this can be implemented in the near future.
For the time being, you'll need to have separate boards for privacy.
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