However, most MCS schemes use a direct mode, in which crowd workers passively or actively select tasks and contribute without interacting and collaborating with each other. Such a mode can hamper some time-constrained crowdsourced tasks.
Researchers from universities in China, Japan, and Sweden execute a different approach: MCS based on word of mouth (WoM), in which crowd workers, apart from executing tasks, exploit their mobile social networks and/or physical encounters to actively recruit other appropriate individuals to work on the task.
They describe a WoM-based MCS architecture and typical applications, which they divide into Internet-scale and local scale. They then systematically summarize the main technical challenges, including crowd worker recruitment, incentive design, security and privacy, and data quality control, and compare typical solutions. Finally, from a systems-level viewpoint, they discuss several practical issues that must be resolved.
About Lori Cameron
Lori Cameron is a Senior Writer for the IEEE Computer Society and currently writes regular features for Computer magazine, Computing Edge, and the Computing Now and Magazine Roundup websites. Contact her at firstname.lastname@example.org. Follow her on LinkedIn.