Track chairs:

  • Omar Alonso (Instacart, USA)
  • Anna Lisa Gentile (IBM, USA)


We invite research contributions to the Crowdsourcing and Human Computation track at the 30th edition of the Web Conference series (formerly known as WWW), to be held April 19-23, 2021 in Ljubljana, Slovenia (

This track focuses on principles, studies, and applications of systems that rely on programmatic interaction with crowds, value creation through collective action, or where human activity and coordination contributes to the execution and operation of computational systems, applications, or services.

We invite submissions that contribute algorithms, techniques, studies, frameworks, systems, or applications of crowdsourcing. Papers should be clearly positioned with respect to prior work, convey the importance of the contributions and findings, and report in detail the methodology used and the obtained results, including a comparison with state-of-the-art methods when appropriate.

Topics include (but are not limited to):

  • Human-centered crowd studies: e.g., human-computer interaction, social computing, demographics, computer-supported cooperative work, design, expertise, usability and human factors, economics, policy, ethics, etc.
  • Systems and data: e.g., scalability, platforms, workflows, data management, training sets, modeling, optimization, programming languages, etc.
  • Applications: e.g., computer vision, interactive crowdsourcing, digital humanities, information retrieval, machine learning, speech and natural language processing, agents, conversational systems, etc.
  • Crowd/human algorithms: e.g., computer-supported human computation, crowd/human algorithm design and complexity, quality control, metrics, mechanism design, etc.
  • Crowdsourcing areas: e.g., citizen science, collective action, collective knowledge, crowdsourcing contests, crowd creativity, crowdfunding, crowd ideation, crowd sensing, distributed work, freelancer economy, open innovation, microtasks, prediction markets, wisdom of crowds.
  • Crowd behaviour: e.g.crowd phenomena, engagement, motivations, incentives, gamification. Submission guidelines, relevant dates, and important policies can be found at
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