I have been a fan, and regular user, of StrengthsFinder for a number of years.  They recently published a new book that looks more closely at how strengths are applied to leadership.  They divided the 34 StrengthsFinder themes into 4 categories: Executing, Influencing, Relationship Building, and Strategic Thinking.  The book includes a code to take the assessment. If your not familiar with StrengthsFinder it’s worth the time and money for you and your team.  The insights you’ll gain into your team are well worth it.