A list building unit, contact system and list building method

A list building unit for building a list of objects in response to a request by a user as a requestor, the list building unit comprising in one embodiment a list provision module for providing a contact list of objects from one or more candidate object lists as created in accordance with a predetermined provision mechanism attributed to a classification for the request, and in another embodiment a list building module for building a first list of providers based on a geographic location provided by a requestor and subsequently, on identifying a provider able to service the request, a second list of providers based on the location of the identified provider able to service the request.