This paper explores how educators can use Wikibooks.org and Wikipedia.org when creating constructivist learning environment on the Web. Educators can design Wikibooks that link together Wikipedia articles and include student-centered and authentic inquiry-based learning tasks. These learning tasks could be Webquests. A WebQuest is a model to teach with the web that was developed in early 1995 at San Diego State University by Bernie Dodge with Tom March. A Webquest is an inquiry oriented activity in which some or all of the information that learners interact with comes from resources on the internet. Open content such as Webquests as part of a Wikibook can make the writing and updating of a webquest a collaborative process for teachers and can also make possible for learners to interact with the task - rewriting it or making changes such as adding links to resources, maintaining links collections, providing tips and messages and adding their own findings/solutions to problems thus changing the task for future learners travelling on the same learning path.