AGN Classification and Unification.
Clive Tadhunter.

I will start with a general discussion of AGN classification and the
general importance of, and difficulties with, the main classification
 schemes. I will then focus on the phenomenology of  radio-loud AGN and
 explanations of some of the major trends in terms of orientation-based
 unified schemes. This will include a critical discussion of the history
 of the unified schemes, the observational evidence (both statistical and
 for individual objects), and recent developments.