The specialisation of some companies in carrying out services for the industries lead to an process of services externalisation, with beneficial effects over the activities of the companies that are producing goods and services and also on stimulating the business market. Externalisation does not imply non inclusion in the activity of the company of those activities that are considered as being subsidiary, that are not strictly necessary or are not directly involved in obtaining results for the main activities of the company. In this context the company appeals to the market in order to benefit from the services or the activities that were externalised.