Blessing White's X Model of Engagement
The "X Model of Engagement" by Blessing White is as important to understanding influencing, motivation, and leadership as Blanchard and Hersey's "Situational Leadership". Combined, the models offer the leader a framework and a methodology to transform their teams. Of course, if I'd been clever enough to come up with both models, we'd have the "Lex Model of Motivation"!!!
The longer version is here: http://youtu.be/gZ3wxgog4nc
Blessing White themselves offer a lot of valuable free resources: www.blessingwhite.com
Dr Ken Blanchard
If you're not yet familiar with Dr Ken Blanchard, this link will get you started on a very useful, pragmatic journey.