WWW03qDriven-Web-Zeng

"Quality driven web services composition" , L. Zeng, B. Benatallah, M. Dumas, J. Kalagnanam, Q. Sheng, WWW Conference, 2003

• Quality criteria used: price, duration, reputation, reliability, availability
• Composite service =an aggregation of all the component services
• Composite service is modeled as a statechart with initial state, final state and paths to travel from the init-state to fin-state
• price =the amount of money that a service requester has to pay for executing the operation (come from the web service providers)
• duration =expected delay between the moment when a request is sent and the moment when the result are received; is the sum of the processing time and the transmission time
  
• reliability =the probability that a request is correctly responded within a maximum expected time frame (computed from historical data)
• availability =the probability that the service is accessible ( assumption: web services send notifications to the system about their running states )
• reputation: the average ranking given to the service by the end users
• MAIN IDEA: algorithms to select the optimal execution plans in terms of quality based on linear programing
• an experiment was conducted using synthetic data.