This article espouses use of the Enneagram for marketing studies. The Enneagram is an ancient framework of personality classification dating back around 2,500 years. In recent years, this framework has demonstrated strong psychometric properties such as reliability and validity. Given the intense amount of information the Enneagram typology provides, it can be successfully used in internal marketing as well as in better comprehending a wide array of other marketing issues.
Available at: http://works.bepress.com/sudhir_kale/2/