Today, the advertising job has become so complex that normally, no business firm chooses to handle the function directly. They employ advertising agencies. And the advertising agency has become a major institution in the field of advertising and marketing.

The advertiser- advertising agency relationship is a very crucial aspect of advertising management. Only when the advertiser and the advertising agency work in close contact and collaborate with each other can the advertising function can be carried out effectively and successfully. The collaboration cannot be limited to the mechanics of developing the advertisements; it has to pervade the entire task of marketing communications.

The firm and the agency must work together in media selection, theme development, message construction and copy development. It is essential that the agency have all the relevant information about the firm, its products and markets, the consumer, the competition and the channels. The agency must become an