Eric Ghysels and Denise R. Osborn provide a thorough and timely review of the recent developments in the ecometric analysis of seasonal ecomic time series, summarizing a decade of theoretical advances in the area. The authors discuss the asymptotic distribution theory for linear nstationary seasonal stochastic processes. They also cover the latest contributions to the theory and practice of seasonal adjustment, together with its implications for estimation and hypothesis testing. Moreover, a comprehensive analysis of periodic models is provided, including stationary and nstationary cases. The book concludes with a discussion of some nlinear seasonal and periodic models. The treatment is designed for an audience of researchers and advanced graduate students.