This book is “the original” work from which Wilson Learning and The Trane Co. have derived their respective training programs on Social Styles.  The presentation is a little bit different and worth the effort to compare/contrast with the latter.  The authors make much more emphasis on versatility than the classes I have taken.  Why?  The original research (sponsored by the DoD no less) found that what leadership style you have doesn’t matter for success – it is your style versatility that counts.  And what do you know, this has resurfaced recently under the guise of diversity!