"Later-no-harm: Adding a later preference to a ballot should not harm any candidate already listed".
In other words, if a method meets Later-no-harm then voters can never get an advantage by truncating.
It is met by IRV, but is incompatible with Condorcet.
I got this from what I found to be the very interesting and illuminating paper "Monotonicity and Single-Seat Election
Rules" by Woodall, and uploaded by Marcus Schulze:
http://groups.yahoo.com/group/election-methods-list/files/wood1996.pdf
Chris Benham
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