Robaldo L., Poesio M., Ducceschi L., Chamberlain J., Kruschwitz U. (2011) Italian Anaphoric Annotation with the Phrase Detectives Game-with-a-Purpose. In: Pirrone R., Sorbello F. (eds) AI*IA 2011: Artificial Intelligence Around Man and Beyond. AI*IA 2011. Lecture Notes in Computer Science, vol 6934. Springer, Berlin, Heidelberg
Recently, web collaboration (also known as crowd sourcing) has started to emerge as a viable alternative for building the large resources that are needed to build and evaluate NLP systems.
In this spirit, the Anawiki project (http://anawiki.essex.ac.uk/)  aimed at experimenting with Web collaboration and human computation as a solution to the problem of creating large-scale linguistically annotated corpora. So far, the main initiative of the project has been Phrase Detectives (PD) , a game designed to collect judgments about anaphoric annotations. To our knowledge, Phrase Detectives was the first attempt to exploit the effort of Web volunteers to annotate corpora (subsequent efforts include  and ).