Michael Lock, Business Psychologist, is co-author of the Formual 4 Leadership assessment and development product suite.  More about the approach can be found at www.formula4leadership.com and the products can be purchased direct from the authors at shop.formula4leadership.com

Hogrefe publishes three of the tests (follow this link to their website) and the work has been translated into many languages - follow this link for the French version of the LJI2.