When Isabel Briggs Myers imagined that her homegrown personality test would change the world, she couldn’t have pictured this. Today, millions take the Myers-Briggs Type Indicator each year. Countless organizations use it, from General Motors to the CIA. But there’s one field that mostly rolls its eyes at the test: psychology. 

In our final chapter, Isabel rescues her indicator from the verge of extinction, but has to make some compromises. And we explore what the Myers Briggs does (and doesn’t) measure, and why people love it despite psychologists' complaints.

Listen to Chapter 1 and Chapter 2 of this series.

Merve Emre is a writer and English professor at the University of Oxford.

Annie Murphy Paul is a science journalist and author.  

Dan McAdams is a professor of psychology at Northwestern University. 

Quinisha Jackson-Wright is a writer and the author of Working Twice as Hard. 

Jeffrey Hayes is the President and CEO of the Myers-Briggs Company.

Rich Thompson is Senior Director of Global Research at The Myers-Briggs Company.

Peter Geyer is a Myers-Briggs practitioner in Melbourne Australia.

Check out Merve Emre’s book, ​​The Personality Brokers: The Strange History of Myers-Briggs and the Birth of Personality Testing.

Read Annie Murphy Paul’s book, The Cult of Personality Testing.

This episode of Science Diction was produced by Johanna Mayer, Chris Egusa, and Senior Producer Elah Feder. Daniel Peterschmidt is our composer, and they mastered the episode. We had fact checking help from Sona Avakian. Special thanks to Peter Geyer for providing archival audio. Nadja Oertelt is our Chief Content Officer.