On Sat, 8 Aug 2015 at 13:12 Alec Muffett <alecm@fb.com> wrote:

Hence this email, in the hope of kicking off a discussion between people who care about human factors. :-)

Can I make my usual radical suggestion? By all means discuss, but once you've finished deciding what you think is best for humans, please actually test your theory. On humans (and that means, not CS students and not Mechanical Turk).