[nathan_hui]

On smaller teams with not much workspace and limited entry options (i.e. only two doors to get into the workspace, and not thirty), you could simply use a piece of paper taped to a wall and remind people when you see them. The thing is, the leaders will know the people who are there the whole time (even if they didn't log in), and the people who didn't log in and who weren't there the whole time likely didn't stay very long anyways, and aren't very committed anyhow.

K.I.S.S.