This book introduces a method called Population-Based Survey Experiments, an offspring of survey and experiments. The author carefully argues some important breakthrough made possible by this method, such as unnecessary dichotomy between internal and external validity, the strength of randomization in skipping covariates, importance of manipulation check, and potential improvement in variable measurement. This book is timely as now computer and internet-based survey lower the barrier for social science researchers to put this method in practice. Arguments are pretty readable for beginners and recommended for many implications this might have for non-user of the method.