  In this review, we hope to give the reader a self-contained contemporary
presentation of the application of Landau theory to ferroelectrics. We begin by
developing Landau theory for homogenous bulk ferroelectrics and then consider
the finite-size (thin film) case within the related Landau-Ginzburg approach.
Next we discuss the treatment of inhomogeneity within this framework. We end
with a number of open questions for future pursuits.
