Abstract: A computer booking system is provided for booking individual ones of a set resources to users of the resources. The resources may be, for example, channels between multiplexes in a telecommunications network. The database creates a pair of data nodes for each booking. Each node has a user field for specifying the user for whom the booking is scheduled, an event field for specifying whether the event associated with the node is the beginning or end of a booking, and a time field for specifying the time at which the event is scheduled to occur. Each node is also located in a single linked list (the time list) of nodes in which the nodes are arranged in order of their event times. Each node is also located in a respective of a set of lists (the value lists). The value lists are arranged in order of rank and each new node is located in the value list of the lowest possible rank.