Pls. refer to below link
johari window model - helpful for personal awareness and group relationships
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20th June 2012 From India, Pune
You can give different sheets to all the members of your board and tell them to write 5 +tive points and 5 -tive points for themselves as well as for all other members of the board. At the end you can analyse the sheets and easily implement the johari window within your board.
22nd June 2012 From India, Bhubaneswar