All week, Wharton professor Katy Milkman has been giving us research-backed tips for making changes that stick. Now, in the final installment of her mini masterclass, she explains why the most durable habit is a flexible one.

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• Katy Milkman’s book is “How to Change: The Science of Getting from Where You Are to Where You Want to Be.” Grab a copy today.

• A few years back, she spoke with Daniel Pink on our sister podcast, The Next Big Idea. You can listen to that conversation here.

• Speaking of Daniel Pink, did you know that every season he teams up with Malcolm Gladwell, Adam Grant, and Susan Cain to pick the two best new books and mail them to your front door? Sign up for a hardcover Next Big Idea Club membership today and get 10% off when you use the code IMMORTALITY at checkout!