Interoperability is the capacity of information systems and procedures to give support, sharing of data and to permit the exchange of information and knowledge among them. It Is necessary for cooperation, development, integration and provision of joint services by public administrations; for the implementation of the various public policies; for the realization of various principles and rights; for technology transfer and reuse of applications for the benefit of improved efficiency; for the cooperation between different applications to provide new services; all this and facilitate the development of electronic administration and the information society.
In the field of public administrations, the recognition of the right of citizens to communicate with them through electronic means implies a corresponding obligation of the same. This obligation, as a basis for the promotion of conditions for freedom and equality are real and effective measures, as well as the removal of obstacles that prevent or impede the full exercise of the principle of technological neutrality and adaptability to the progress of information and communication technologies, thereby ensuring independence in the choice of technology choices by citizens, as well as the freedom to develop and implement technological advances in an area of free market.
Law 40/2015, of 1 october, from The Legal Regime of the public Sector, recognizes the role of interoperability and refers to it as one of the areas in which it is imperative that the laws are common and must therefore be addressed by the organisation of a state.