This kind of work fascinates psychologists, economists and managers because it raises the possibility that productivity in the workplace can be manipulated by c

This kind of work fascinates psychologists, economists and managers because it raises the possibility that productivity in the workplace can be manipulated by clever management rather than by expensive financial incentives. In my experience, I've had the best luck simply being clear and consistent about assignments and desired expectations (from both the manager and the worker end). For instance, in regards to this experiment on Mechanical Turk, I would probably include in the description that each photo should have around 10-15 tags if that was the level of categorization that I wanted.