] Not only is there an open call by an employer to the crowd, the crowd also collaborates on the whole task by each member addressing a small piece of the pre-divided work. Professional tasks, in contrast, might have multiple people working on them, but there is no collaboration among them, and their work usually involve a higher degree of innovation. Game tasks are again a different animal, since they copy many attributes of the other two, but add another layer by aiming to be entertaining as well as purposeful. 