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I have 2 boards - one project based with members and on that is 'private' todo lists with only me as admin / member. Can I invite a member from the other board to be able to view / interact with a specific card on my personal board without them viewing all my other cards? (At the moment I cannot see any invitees in the add member box within the card)

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Not what you asked for, but Astrid.com is a todo list tool that does allow you to share individual tasks or entire lists with other users without revealing your private tasks. – dsh Aug 1 '12 at 17:56
This question is not exactly what you asked, but has some solutions (for viewing only, not interacting). – fiatjaf Mar 23 '15 at 1:57

I have just recently tried to do this myself. It does not seem possible. What I did instead (not a complete workaround) was to create a new board in an organization that is visible to the organization members. They can view, vote, and comment, but nothing more.

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That would not be possible. Usually by my understanding, at this moment, Trello does not allow you to specify permissions on cards. You can only add members to a card after adding them to the board.

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OK, thanks. But once added to a board you can then add members again to individual cards. I am not sure what purpose this serves ... hence my question above. – Robin Jul 31 '12 at 17:41
That would be similar to task delegation. Something like saying: "The task of finishing up on this card is handed over to the following people..." – Okeke Emmanuel Oluchukwu Aug 1 '12 at 18:30

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