Wikis are a web page that allows multiple users to view and modify a document. This can be used for anything from organising an event to collaborating on a group assignment.
A wiki has multiple authors, which means it has the capability to explore multiple ideas very quickly.
In a classroom wikis promote critical thinking as students are forced to question the content supplied by their peers. The opportunities for using wikis in the classroom are endless. Teachers can develop authentic tasks for students and with the use of a Wiki students will not only be able to generate ideas they will have the opportunity to work collaboratively with peers to correct, improve, evaluate and discuss multiple ideas. The idea of authentic assessment and collaborative work was highlighted by Kearsley and Shneiderman (1999). They state the underlying idea of the Engagement Theory is for students to be engaged in meaningful tasks in collaboration with their peers (Kearsley & Shneiderman, 1999).
Kearsley, G., Shneiderman, B. (1999). Engagement Theory: A Framework for technology-based teaching and learning. Retrieved August 12, 2009, from http://home.sprynet.com/~gkearsley/engage.htm