1. A method for result aggregation in a crowdsourcing environment, the method comprising: providing a task with a plurality of solution options; receiving responses for the task from multiple workers, wherein each of the responses comprises a worker response confidence value corresponding to one of the plurality of solution options, and wherein the worker response confidence value is indicative of confidence of a worker for the one of the plurality of solution options to be correct; estimating a task answer for the task based on at least the worker response confidence value received from each of the multiple workers; and computing a performance bonus for each of the multiple workers based on the task answer, the worker response confidence value in the response from each worker, and a Proper Scoring Rule.