I've always believed that, in career and financial planning, a person needs a deeper understanding of their personality to succeed, but many frameworks exist, and adherents to one often pour scorn on others. For example, folks who subscribe to the Big5 OCEAN personality models pooh-pooh the folks who follow the MBTI framework. Of late, having exposed myself to the idea that personality can be determined by neurotransmitters, as in my last article, I am beginning to see the usefulness of treating all personality frameworks as a stack, like the OSI model in networking engineering. If we can arrange theories of personality as a stack, we can start at low levels, examining biochemistry, and move up to models based on actual brain structure, like the OCEAN model. Above OCEAN are the more HR-oriented models, like MBTI. We can then go even further and incorporate ancient techniques, such...