An online work management system provides a marketplace for multiple job owner and workers. The job owners provide a job description that defines task. The job description may be processed to generate task descriptions that may be published for workers' application. The task descriptions specify the qualification or restrictions for workers to have the task assigned. The online work management system also provides various functions supporting coordination and management of task assignment such as determining the trust level of the user's identity, search the tasks or workers, monitoring the progress of job, managing payment to workers, training and testing the workers, evaluating the review by the job owners, and generation of surveys.