It turns out this particular scheme is simple. You have type A and type B. This is not Meyer-Briggs or the DISC scheme (whatever it is called). This is refreshing and simple. This wikipedia article probably tells you all you might want to know:
Interestingly, this scheme was hatched by cardiologists who believed that type A people were more likely to have heart disease. And of course, all kinds of whining and controversy followed on the heels of their ideas being published.Type A people tend to be ambitious and impatient, often workaholics. In general they are trying to get more done than available time allows.
Type B people are pretty much "everone else". Less stress is the name of the game here.
And there you have it. I thought perhaps there might be C and D, or even a whole alphabet of personality types, but it is all pretty monochromatic. Is it good or bad to be type A? It is certainly bad if they give themselves heart disease, as per the original theory. You may find yourself asking whether stress is good or not. Specific goal oriented stress can be a good thing and a powerful motivator. Chronic stress, or stress as a lifestyle is clearly bad. Denying that a persons mindset affects their health seems delusional. Read the Wikipedia article.
There is some weird story involving the tobacco industry. Apparently they were trying to argue that the correlation between smoking and cancer was not due to tobacco, but due to the type A lifestyle which was the root cause (causing both cancer and the smoking habit). A strange narrative that does not deserve more than this brief mention.
Tom's Money pages / tom@mmto.org