1. Defined with Work Styles of employee engagement. (O*NET)
2. Based on a study of newly-hired employees.
Chang, E. and Hancock, K. (2003), Role stress and role ambiguity in new nursing graduates in Australia. Nursing & Health Sciences, 5: 155–163.
3. From a Meta Analysis of employee engagement.
Harter, James K.; Schmidt, Frank L.; Hayes, Theodore L. Journal of Applied Psychology, Vol 87(2), Apr 2002, 268-279.