So far no bill has bounced between the Houses more than 15 times, but one constraint on the process might be finding a different ink to signify the exchange of amendments.

BBC: That most mysterious of Westminster rituals

Like the movie business, the games business is limited by the bandwidth-constraint online, but it has more flexibility to get around the problem.

ECONOMIST: Games and the Internet go well together

The more intensely you feel those emotions, the bigger the constraint may be.

FORBES: How I Learned to Relax and Love the Constraints (or, How to Get a Panoramic View of You)