Abstract
This paper presents a case study of an online citizen science project that attempted to involve volunteers in tasks with multiple dependencies including analyzing bulk data as well as interpreting data and writing a paper for publication. Tasks with more dependencies call for more elaborate coordination mechanisms. However, the relationship between the project and its volunteers limits how work can be coordinated. Contrariwise, a mismatch between dependencies and available coordination mechanisms can lead to performance problems, as were seen in the case. The results of the study suggest recommendations for design of online citizen science projects for advanced tasks.