By its results with your students, of course. Prior to using your WebQuest on anyone, though, score it with this rubric to see where it might be improved. Lessons Learned from the San Diego Microworlds Project 1.A constructivist project is most likely to succeed if it incorporates a certain degree of structure. Giving students the opportunity to play specific roles allows some to succeed who don't do well in the more typical classroom environment. In a project that invites creativity and is open-ended, it's important to set realistic boundaries.
Time is precious.
In designing constructivist units, it's important to minimize time spent that doesn't contribute to learning. Dodge Visit Professor Bernie Dodge's home page.