University of Georgia: John Burnett's "Core Concepts of Marketing, Chapter 10: Channel Concepts: Distributing the Product"
Please click on the link above and read the entire chapter. Note that the push and pull strategies are based on how the customer perceives a product. For example, if the company really wants to sell a product, it may aggressively push it through the distribution channel and into stores with pricing incentives. This is often seen with products the customer does not have a perceived need or desire for yet. A pull strategy is based on satisfying a customer's want or need. It is almost as if the customer is pulling the product through the distribution channel. Channel membership is a distribution strategy based on the type of product in question. If quality and reliability is important, marketers will use exclusive distributions, i.e. "authorized resellers." An intensive distribution is the opposite; a marketer will allow just about anyone to carry a product. Convenience foods are a good example. Just about every check-out line in a store now carries snacks and sodas.