Impact of screening technique on crowdsourcing QoE assessments

Evaluation of quality as perceived by the user in his natural environment is a difficult and strenuous task. Simulation of real world conditions in the laboratory is often inefficient and expensive. Recently, crowdsourcing as novel methodology for testing Quality of Experience (QoE) at the end user side has been proposed. In this paper we discuss (a) the challenges of performing subjective assessments in the crowdsourcing domain and (b) highlight the importance of proper filtering of unreliable users from the overall results. In particular, we introduce various ways for detecting unreliable users and compare results from two similar QoE studies applying different screening techniques.