This activity can be done with any novel as a lesson about character. It was a strategy used as part of the CLAS test developed by the state of California to produce more open ended thinking.
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Here is a Student sample Open Mind for Gonzalo in Seedfolks by Sid Fleishman
Open Mind template from freeology.com
Blank Open Mind
Character Traits Open Mind
Characterization Open Mind
The Split Open Mind is useful to chart changes in a character.
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Sample of Split open mind from A Christmas Carol