For this unit Refers to Student’s Book pages Writing headlines

traffic department
 (which manages the flow of work 
between the various teams) and the 
research department
 (which analyses markets, 
industries, competitors, etc. on behalf of clients or in preparation for campaigns). 
Adverts may be delivered via television, radio, cinema, magazines, newspapers, video 
games, the Internet and billboards. Adverts may be placed in a wide range of public 
places, for example the sides of buses or buildings, in lifts or the screens of ATMs, etc., 
or may be distributed on leaflets, flyers and brochures. Audio adverts may be heard 
over public address systems in shops or in telephone recorded messages. 
Useful web links:
An introduction to the work and organisational structure of advertising agencies 
http://en.wikipedia.org/wiki/Advertising_agency
Various forms of advertising
http://en.wikipedia.org/wiki/Advertising
ADDY awards for advertisements
http://www.aaf.org