The manner which makes the nullity choice in the conversational mode configuration system effective

摘要

An interactive computer configuration system is an aid for a sales person or a customer to make it easy to grasp and configure a huge configuration problem. The user interacts with the computer system and makes many choices successively, and a configuration engine checks each choice for validity. The configuration engine comprises a configuration model defining mutual predefined relations between the selectable elements and comprises programs for validating a set of choices against said configuration model. The invention relates to the situation where a requested choice made by the user corresponds to an invalid configuration instance. According to the invention, the user is allowed to insist on this choice and an alternative investigation system according to the invention will present to the user a number of relevant proposals for undoing choices made previously so that a valid configuration instance can be obtained. According to the invention only relevant proposals are presented to the user and further in the most expedient way, seen from a customer's point of view. According to the invention the lowest possible number of choices to be undone is first presented to the user. Yet, a further aspect of the invention allows the user, during the alternative investigation process, to make previous choices cardinal choices, whereby the relevance of the proposals for obtaining alternatives will be further enhanced.