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Trust in ICT 3

Figure IV.13 – Used car transaction service high level illustration

6.2 Actors

As the participants in the used car transaction process depicted in Figure IV-13 have different goals, each
actor plays a distinctive role and conducts different function.
• Dealer

– The major role of a dealer is mediating buyer and seller (owner) to gain economic profit.
– A dealer can sell the possessed cars, which were already purchased, or can mediate the
transaction between sellers and buyers.
• Buyer
– A buyer is someone who wants to purchase a used car from a dealer or seller.
– When a buyer wants to purchase a used car, a buyer can search the car in a market place or on
the web provided by service broker.
– When a buyer requests dealers and brokers for purchasing the car, he or she generally describe
the specific constraints such as vehicle age, accumulated mileage, brand, model, budget, and
so on.
– Based on identified information about the condition of the car, he or she can make a purchase
decision under relatively low uncertainty and risk.
– The more provided information is trustful and abundant, the more they can reduce risk and
uncertainty.
• Owner (Seller)
– An owner (seller) is someone who wants to sell his or her car to others including a dealer and
individual buyer.
– When an owner tries to sell the car, he or she simply sell a dealer or an individual the car at a
negotiated price. Otherwise, he or she can ask a dealer transaction brokering.
• (Trust) Service Broker
– Trust service broker is a broker mediating an interaction among buyers, sellers, and dealers
through the information transferred by trust management platform.
– Based on the information, trust service broker can inform the identified level of trust of owner,
registered vehicle, and seller.

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