  Significant effort has been made to understand user motivation and to elicit
user participation in crowdsourcing systems. However, incentive engineering,
i.e., designing incentives that can purposefully motivate users, is still an
open question and remains one of the key challenges of crowdsourcing
initiatives. In this work in progress, we propose a general and systematic
incentive engineering framework that system designers can use to implement
appropriate incentives in order to effect desirable user behaviours.
