Twenge takes this book to look at what she calls iGen, which is what she calls the generation just after Millenials. She draws conclusions, backed by research, showing how the ubiquitous access to devices has changed how the generation acts, and reduced their freedom to experiment with being an adult in the teenage years as their parents didn't let them out much without supervision.

Overall, I enjoyed the research backed writing of Twenge in iGen. When multiple explanations were possible for generational change, she did an effective job of eliminating factors that were likely not involved. While there are a bunch of charts and references, the writing is not so academic as to make it hard to follow her points.

I enjoyed iGen and can see it becoming a commonly referenced book in my library.