Multiagent environment design in human computation

Human computation aims to solve computationally-hard problems, e.g. image tagging or commonsense collection, by utilizing collective human brain power. There are a variety of applications available nowadays. Games with A Purpose (GWAP) [4] engage players in an online game and let them help solve tasks while having fun. Crowdsourcing markets, such as Amazon Mechanical Turk (http://mturk.com), provide platforms for workers to contribute their brain power in exchange for monetary rewards. Peer productions systems, e.g. Wikipedia or Yahoo! Answers, let online users construct knowledge bases for common good.