In microtask crowdsourcing, microtasks are designed and planned by task owners beforehand. However, there are two reasons why it is difficult for task owners to envision and create microtasks for interface design tasks.

• First, the process of interface design is unpredictable. Different designers typically take different approaches to the same design problem

• The results of interface design are unpredictable. A high quality interface design often reflects novel ideas from creative designers, ideas that in many cases are beyond the customers’ expectations