1. Explain what is meant by a ‘compensation action' and, using an example, show why these actions may have to be included in workflows.
2. For the example of the vacation package reservation service, design a workflow that will book ground transportation for a group of passengers arriving at an airport. They should be given the option of booking either a taxi or renting a car. You may assume that the taxi and car rental companies offer web services to make a reservation.
3. Using an example, explain in detail why the thorough testing of services that include compensation actions is difficult.