I've known my MBTI for many years, so what? It wasn't until I read this book that I understood all the implications. The book goes beyond just explaining your personality type, but actually provides useful information regarding how to deal with each. Information is displayed in great succinct charts covering such aspects as: expression of attitudes, motivators, inner tensions, development recommendations, how the type gathers/absorbs information, valued relationship qualities, as well as hot buttons, prejudices, and other issues. I purchased two copies, one to keep and one to distribute among my team.