• In the majority of cases, the unsupervised crowd produced unsuitable workflows, or unsuccessful results.
• The most frequent type of failure was derailment, a phenomenon that occurred when the PDS algorithm failed to terminate and continued to produce steps indefinitely.

Derailment can happen for multiple reasons:

• First, workers were confused about appropriate task granularity.
• Second, workers authored subdivisions that could be executed by a single worker, but not split across separate workers.
• Finally, workers who had lost the context of the overall workflow generated decompositions that restated previous tasks as subtasks, leading to cyclic behavior.