In 1906, 787 people guessed the weight of an ox. The median guess was accurate to within 1% of the true weight. This points to the wisdom of the crowd under specific conditions. Crowdsourcing – having a group solve a problem and then sharing the solution with the public – may be useful for developing more effective HIV services. Crowdsourcing challenge contests have been used to help inform youth-friendly HIV policy, develop new HIV interventions and create user-friendly HIV programmes. WHO/TDR commissioned a practical guide on implementing and evaluating crowdsourcing challenge contests. This workshop provides an interactive introduction to the practical guide, providing step-by-step assistance for those interested in organizing challenge contests. This will be useful for advocates, scientists, community leaders and programme managers. The workshop is organized by Social Entrepreneurship to Spur Health, a hub within the WHO/TDR Social Innovation in Health Initiative.

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