The purpose of the following informal lectures is to give a brief introduction to
descriptive dynamics, which I understand here to be the descriptive theory of
Polish group actions. I will concentrate on the foundations, and hopefully at
a level accessible to anyone with a basic knowledge of descriptive set theory.
I will illustrate some of the main methods used in this area, including Baire
category arguments and various implementations of the "changing the topology"
technique. A general reference for the results discussed in this paper is
Becker-Kechris [1996]
