je peux vous envoyer des references à ce sujet (mais en espagnol), j´ai une camarade @ l´université qui fait son doctorat en développement rural, elle travaille avec une organisation TOSEPAN TITATANISKE (plus de 40 ans d´existence)
Largely by introducing a new element – the need for leaders to develop their leadership presence, attitude toward others and behavioral flexibility by practicing psychological mastery. It also offers a foundation for leaders wanting to apply the philosophies of servant leadership and authentic leadership.
Related articles on distributed leadership, servant leadership, and leading in the workplace are at http://www.adb.org/publications/distributing-leadership, http://www.adb.org/publications/exercising-servant-leadership, and http://www.adb.org/publications/leading-workplace, respectively.
You can measure satisfaction ot the needs for autonomy, relatedness, and competence. See this article for a validated measure: Van den Broeck, A., Vansteenkiste, M., De Witte, H., Soenens, B., & Lens, W. (2010). Capturing autonomy, competence, and relatedness at work: Construction and initial validation of the Work-related Basic Need Satisfaction scale. Journal of Occupational and Organizational Psychology, 83(4), 981-1002. doi: 10.1348/096317909x481382
You can assess his performance on the basis of his job/roles being assign to him, his behaviour towards his co workers/ employees while performing the assigned roles.
You might consider emotional intelligence or emotional competencies. If you look on google scholar at the work of Richard Boyatzis, you should find some information on these areas. The emotional competency inventory has been used successfully for this and I think he has a newer version referred to as the ESCI (emotional skills competency inventory). I know it is available through the Hay Group.