WebQuests should contain at least the following parts:
An introduction that sets the stage and provides some background information.
A task that is doable and interesting.
A set of information sources needed to complete the task. Many (though not necessarily all) of the resources are embedded in the WebQuest document itself as anchors pointing to information on the World Wide Web. Because pointers to resources are included,
A description of the process the learners should go through in accomplishing the task. The process should be broken out into clearly described steps.
Some guidance on how to organize the information acquired. This can take the form of guiding questions, or directions to complete organizational frameworks such as timelines, concept maps or Vee diagrams.
A conclusion that brings closure to the quest, reminds the learners about what theyíve learned, and perhaps encourages them to extend the experience into other domains.
http://edweb.sdsu.edu/EdWeb_Folder/courses/EDTEC596/About_WebQuests.html