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This books includes 1) History and development of cognitive functions, 2) Description of each function, 3) Description of each MBTI type, 4) Debating topics on cognitive functions and the MBTI system, 5) How to type yourself and others, 6) Stacks

This book is split into two sections. The first is Clinical Enneagram, developed by Naranjo and his students, Maitri, Duran and Catalan, and so on. The second section is Protoanalysis, the original system of the Enneagram developed by Ichazo and some his stude...

My own description of The 4 Temperaments system. Don't know if there actually is an official version, but this probably isn't it if there is one.

What is typology? How to use it? How to type yourself and others? What are the common mistypes? Why is PDB serious about typology?

Systems that are not available on PDB for typing characters and celebrities. For example, Moral Alignment, Horsenality, Zodiac, etc.

FAQs and inside jokes. Click "Info" to 🔍 search for content in this book.

This book mainly focuses on logical fallacies in personality analysis and typology discussions

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