Patent ID: 7650315

Claim:
A computerized transaction server having a processor for concluding contracts between a service user and a service provider, comprising: a user interface with a number of data input modules which comprise data input fields for inputting data relating to the object of a contract, the user interface servicing users by way of terminals via a telecommunication network; stored data rules assigned to the data input fields; a validation module implemented by the processor and configured to check data values input via the data input fields on the basis of the assigned data rules to request corrections via the user interface on the basis of the assigned data rules and to generate a validation result; stored business rules assigned to one or more of the data input fields; an evaluation module configured to evaluate the data values input via the data input fields on the basis of the assigned business rules and configured to generate a corresponding evaluation result, and a plurality of contract negotiation process units configured to indicate a contract price via the user interface, to request and receive an agreement relating to the conclusion of a contract from the service user via the user interface, and to store a concluded contract; a control module configured to activate a first one of the data input modules, to activate the evaluation module in the case of a positive validation result, and to automatically select and activate a further one of the data input modules or one of the plurality of contract negotiation process units based on the evaluation result, wherein the plurality of contract negotiation process units indicate a contract price based on the data value input via the data input fields and based on a first predetermined criteria when a positive evaluation result is determined and based on a second predetermined criteria when a negative evaluation result is determined.