InhaltsangabeCapacities and analytic sets.- Eomogeneous trees and projective scales.- The axiom of determinacy, strong partition properties and nonsingular measures.- The axiom of determinacy and the prewellordering property.- Souslin cardinals, ?-souslin sets and the scale property in the hyperprojective hierarchy.- Closure properties of pointclasses.- A note on wadge degrees.- Ordinal games and playful models.- Measurable cardinals in playful models.- ? 2 1 monotone inductive definitions.- Trees and degrees.