The Spanish government are making a considerable effort in recent years to guarantee citizens their right to interact electronically with them. Legal security, essential in the implementation of e-government, has taken part of that effort, aimed at the development of Law 11/2007 and materialized in RD 1671/2009 partial development of Law 11/2007, and then, in the RD 3/2010 and 4/2010 concerning national security schemes and interoperability respectively, which develop the principles and guidelines needed to create an environment of trust in technology systems and cooperation between the various authorities. In July 2011, they have released seven of the technical standards for interoperability of the series pursuant to RD 4/2010. This text presents the main aspects of technical standards for interoperability relating to the electronic document, the methodology for their development as well as the collaborative context in which they occurred.