We summarize the main motivations to study event shapes at hadron colliders.
In addition we present classes of event shapes and show their complementary
sensitivities to perturbative and non-perturbative effects, namely jet
hadronization and underlying event.Comment: 10 pages, 9 figures, talk given at the FRIF Workshop on First
Principles Non-Perturbative QCD of Hadron Jets, Paris, January 200