Sales techniques

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  A sale can take place through:[2]
  Direct sales, involving person to person contact
  Pro forma sales
  Agency-based
  Sales agents (for example in real estate or in manufacturing)
  Sales outsourcing through direct branded representation
  Transaction sales
  Consultative sales
  Complex sales
  Consignment
  Telemarketing or telesales
  Retail or consumer
  Traveling salesman
  Door-to-door methods
  hawking
  Request for proposal – An invitation for suppliers, through a bidding process, to submit a proposal on a specific product or service. An RFP usually represents part of a complex sales process, also known as "enterprise sales".
  Business-to-business – Business-to-business sales are much more relationship-based owing to the lack of emotional attachment[citation needed] to the products in question. Industrial/professional sales involves selling from one business to another
  Electronic
  Web – Business-to-business and business-to-consumer
  Electronic Data Interchange (EDI) – A set of standard for structuring information to be electronically exchanged between and within businesses
  Indirect, human-mediated but with indirect contact
  Mail-order
  vending machine
  Sales methods:
  Selling technique
  Consultative selling
  Sales enablement
  Solution selling
  Conceptual Selling
  Strategic Selling
  Transactional Selling
  Sales Negotiation
  Reverse Selling
  Paint-the-Picture
  The take away
  Sales Habits

Source : http://en.wikipedia.org