One of the greatest decisions a team leader will make is the scope of their focus. How wide? How narrow? You must be narrow enough to achieve concentrated excellence. You must be wide enough to maintain sufficient relevance. This is true when you are the individual researcher thinking of your life work. This is true when you are the CEO of an organization. Most err on the side of too wide, not too narrow, and achieve a pseudo-profundity that is four inches deep and four miles wide.