Chris Musselwhite and Tammie Plouffe created the Influence Style Indicator, which I use to teach influence to lawyers and other professionals Here is a brief article on the approach.
“Effective leadership today relies more than ever on influencing others — impacting their ideas, opinions, and actions. While influence has always been a valuable managerial skill, today’s highly collaborative organizations make it essential. Consider how often you have to influence people who don’t even report to you in order to accomplish your objectives. Success depends on your ability to effectively influence both your direct reports and the people over whom you have no direct authority.
Have you ever thought about how you influence others? The tactics you use? We are all aware that people use different influencing tactics, but did you realize that we each naturally default to the same tactics every time? Or that the tactics we default to are also the ones to which we are most receptive when being influenced?”
Read the article here.