Usability - a very clear graphic for a complex subject (BMI)

I a big fan of usability and making messages clear and simple.

One of the problems with Body Mass Index is that the calculation is fiddly, not terribly intuitive and easy is to get wrong.

The attached graph is great - it is clear and simple that my weight is OK - a couple of years ago I was probably a bit over-weight but now I'm OK :)

usability (noun) ease of use, user-friendliness, accessibility, convenience, intuitiveness