This very clear and concise book about the DISC concept and its application is the perfect complement of the MT podcast series about DISC.
There is a quick test to determine your DISC profile.
I was surprised to find a different profile compared to the online test I did some time ago (high D high C). This time, I am a high I (highest score) and high D (second highest score).
Later in the book, the author explains that there are 3 aspects to be taken into consideration : SOS (self, other and situation). This is a core concept of the DISC theory. Your profile is dependant on the situation. The author constantly warns us against "labelling" - saying "he is a high D". We can act high "D" in some situations and high "I" in others.
I am high D/C at work because circumstancies make it necessary and I am high I when with my friends on vacations (here I dont want to lead).
The book offers a very detailed description about how to communicate, delegate, give feedback to each profile and a good description about multi-dimensional profiles (like DC, IS, etc). I find it much more efficient than the very detailed results you get from the online test (creative, entrepreneur, ...). I find those too restrictive.
The last chapter about "the profile of your organisation" leaves me a little doubtfull. DISC is a fantastic tool for face to face communication. I dont see it as adapted when trying to determine how to behave in relation to one's organization. You interact with PEOPLE not with ORGANISATIONS or COMPANIES.
If you are interested in DISC and improving your relation with others in your organization, the book is the perfect tool.