Here are some useful documents about developing grit in your students:
Can you pass the grit test
12-item Grit Scale.08-item Grit Scale
Child Adapted Version_0215125312011
8-item Grit 081011
5-item ambition scale093011
Previous ArticleThis much I know about…the writing process
Some extra grit stuff here too. http://www.kristianstill.co.uk/wordpress/2012/05/04/grit/
My Yr 11 last summer found their results quite revealing.