While Gretchen Rubins clearly did a lot of background work for this book, I found it superficial. Every month, Ms. Rubins picks a handful of projects designed to bring happiness -- cleaning her closest, being nicer to her husband, etc. -- but I felt that the projects could have been more thoroughly researched and implemented. My biggest complaint is that while Ms. Rubin's briefly describes the research that leads her to pick her projects (hugs that last at least 6 seconds raise endorphins), she does not cite any references for her research. Also, some of her attempts (like the mindfulness month), blatantly disregard important components of a discipline that she didn't seem to spend much time trying to understand. This is a quick read, but it felt unfulfilling.