US Patent 11074537 Candidate answer fraud for worker assessment

Particular embodiments may receive results from completion of a first set of a plurality of iterations of a workflow, the workflow comprising one or more tasks performed by one or more workers. A result for a task may be received from a worker. An outlier model may be determined based on a vector of behavioral features of the worker. A determination may be made regarding whether the result is fraudulent, based on the outlier model and a global normal feature vector.