Examples of initiatives in crowdsourcing for education where contributors are external actors.
- Writing Word Problems and Hints
- Oppia
- CrowdCrit

San Jose State University

Contributors are those that serve the learner crowd. They are typically part of the learner crowd or an external crowd. 

Contributors in Crowdsourcing for Education

Jiang, Y., Schlagwein, D., & Benatallah, B. (2018). A Review on Crowdsourcing for Education: State of the Art of Literature and Practice. PACIS, 180

A Review on Crowdsourcing for Education: State of the Art of Literature and Practice

Examples of initiatives in crowd sourcing for education where learners also serve as contributors.
- ClassOverflow
- Quasi-Crowdsourcing Test (QCT)
- OLC
- DLMA

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