I think Wordle has extremely large potential within the field of education. Children in general are very visual, and seeing a word picture could help them understand ideas or concepts. Also, Wordle could be useful in helping to introduce a lesson, because the teacher could discuss most important topics first, and then continue on with other aspects of the lesson. Moreover, Wordle could be very useful to do an activity such as the one done during class, in which the instructor takes papers written by students and puts them all into one word picture, so the students can see which ideas and themes they collectively wrote most about.
Wordle Ideas
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By searching google for "Wordle," I was able to find an entire slideshow on uses of Wordle for education. This is extremely useful, and it is something I will look at again because some of the ideas are very good tools for teaching.