“…Having created many GWAPs (e.g., ESP Game, Peekaboom, Phetch, and Verbosity), Luis Von Ahn and Laura Dabbish reports in [31] on three game-structure templates that generalize successful instances of Human Computation games: input-agreement games, inversion-problem games, and output-agreement games. In input-agreement games, players must determine whether they have been given the same input; in inversion-problem games, given an input, a player produces an output, and another player guesses the input; in output-agreement games, players are given the same input and must agree on an appropriate output.…”