A method and a system for improving the selection of a group of services, in an exchange services environment, by a user of a telecommunication network. The following steps are comprised by the invention: defining a first set of requirements in a selection criteria manager module to be fulfilled by the services; performing a search among all services available, according to services functionalities defined in a service catalog and matching the first set of requirements; discarding services which do not fulfilled the first set of requirements; defining a second set of requirements in the selection criteria manager module, the second set of requirements indicates user preferences; assigning weights to the services taking into account the second set of requirements, data from an historical information module of previous selections of the user, data from a profile of the user with previous preferences; arranging all service combination according to the weights obtained, being the first one an optimal selection; storing the selection of the user at the historical information module.