Gee it's personality typing. That sounds very restrictive but it isn't. It's really a way of better understanding why and how you are different from others. The basic principal is that there are 8 personality factors and each of us tends to use a certain combination of 4 of them. For instance I am an INFP which stands for Introverted iNtuitive Feeling Perceiver. But don't be fooled by the words because they don't mean exactly what you might think for instance someone who has J for Judger doesn't mean they are Judgemental. There are simple tests you can take to determine your personality type.
You can look up Meyers-Briggs on the web and also find the the Book "Please Understand Me 2".
I find it usefull when trying to deal with people at work because I sometimes I can see immediately the different factors in their personality. Now it doesn't mean it makes it easier to communicate with them especially if they are a complete opposite of me but at least I have a slightly better appreciation of where they are coming from or why they react the way they do.
If anything I find it most usefull for unstanding and accepting myself especially as F, I've been able to get a handle on my turmoil of emotions always bubbling under the surface and instead of feeling like an alien all the time for being more emotionally reactive then people around me I can work with myself and deal with my emotions when I have them. If that makes sense
