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The Code Behind the 16 Types, by James R.G.

Cracking the Personality Code

Decipher yourself and understand others.

This book shows how the cognitive functions and attitudes combine to form each of the 16 types. Once you can see that structure, you can understand why people think and act the way they do, starting with yourself.

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$29.99 USDPDF eBook, readable on any device

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Cover of The Code Behind the 16 Types by James R.G.

What's inside

Most introductions stop at the four letters. This book goes underneath them to the functions that actually drive each type.

  • The cognitive functions in depth

    The core mental processes behind every type, and how they shape behaviour, decisions, and relationships.

  • All 16 types, layer by layer

    The patterns and motivations beneath the surface traits, so you understand yourself and the people around you.

  • Strengths and challenges

    Each type's natural strengths and likely difficulties, and how to make the most of your own.

  • Advanced typing techniques

    How to identify types accurately by reading the functions behind the traits in real-world situations.

  • Type and personal growth

    Practical ways to use what you learn about your type to build a more authentic, fulfilling life.

  • Grounded in the field's major thinkers

    Built on the work of Carl Jung, John Beebe, David Keirsey, Linda Berens, and Dario Nardi.

Topics covered

  • Cognitive functions
  • Cognitive attitudes
  • Temperaments
  • Interaction styles
  • Four sides of the mind
  • Cognitive axes
  • Cognitive orbit
  • Functions in language
  • Compatibility
  • Typing

Sample pages

Look inside the book

Diagrams and explanations from across the book. Select any page to see it full size.

About the author

Written by James R.G.

James R.G., author of The Code Behind the 16 Types

James holds a Bachelor's in Psychology and has spent the past five years studying Jungian typology. He founded OnType to teach the 16 types the way the theory actually works, rooted in the people who developed it.

The book also includes his own work on how the cognitive functions show up in the language we use every day.

The work this book draws on

  • Carl Jung
  • John Beebe
  • David Keirsey
  • Linda Berens
  • Dario Nardi

Want to be typed by the author? James offers one-on-one typing sessions by video, phone call, or live text chat, starting at $29.99 USD for 20 minutes.

See typing sessions

Questions, answered

What's in this book that I can't get elsewhere?

Beyond an in-depth look at the cognitive functions and attitudes, it covers topics most introductions skip: interaction styles, temperaments, the four sides of the mind, cognitive axes, orbits, and practical typing skills, all in one place.

Where does the information come from?

It draws on the foundational work of Carl Jung, Linda Berens, and David Keirsey, who developed the cognitive functions, interaction styles, and temperaments respectively, along with insights from C.S. Joseph. James adds his own contributions, particularly on the logic of how the functions appear in language.

Is it suitable for beginners?

Yes. It's written for anyone curious about personality and human nature, whether you want to understand yourself better, understand the people around you, explore compatibility, or learn how personality works at its core.

Is there a physical copy?

No. The Code Behind the 16 Types is available only as a PDF eBook, so you can read it on your phone, tablet, or computer.

Ready to become an expert?

Get The Code Behind the 16 Types as a PDF eBook for $29.99 USD.

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