Extended Enterprise Modeling Language (EEML) is from the late 1990s, developed in the EU project EXTERNAL as extension of the Action Port Model (APM) by S. Carlsen (1998).<ref>Carlsen, S. (1998). "Action port model: A mixed paradigm conceptual workflow modeling language". In: ''Proceedings of Third IFCIS Conference on Cooperative Information Systems'' (CoopIS'98), New York.</ref> The EXTERNAL project <ref>EXTERNAL EXTERNAL - ''Extended Enterprise Resources, Networks And Learning'', EU Project,
IST-1999-10091,</ref> aimed to "facilitate inter-organisational cooperation in knowledge intensive industries. ItThe isproject theworked hypotheses ofon the projecthypothesis that interactive process models form a suitable framework for tools and methodologies for dynamically networked organisations. In the project EEML (Extended Enterprise Modelling Language) was first constructed as a common metamodel, designed to enable syntactic and semantic interoperability".<ref>Håvard D. Jørgensen (2004). [http://www.idi.ntnu.no/grupper/su/publ/phd/Jorgensen-thesis.pdf ''Interactive Process Models'']. Thesis Norwegian University of Science and Technology
Trondheim, Norway. p.173-202.</ref>
It has beenwas further developed in the EU projects Unified Enterprise Modelling Language (UEML)<ref>[[François Vernadat]] (2002). "UEML: towards a unified enterprise modelling language". In: ''Int. J. Production Research'', 40 (17), 4309-4321.</ref> from 2002 to 2003 and the ongoing ATHENA project.<ref>[[John Krogstie]] and [[T.A. Halpin]], Keng Siau (2004). ''Information Modeling Methods and Methodologies''. Idea Group Inc (IGI), p.73.</ref>
The objectives of the UEML Working group has beenwere to "define, to validate and to disseminate a set of core language constructs to support a Unified Language for Enterprise Modelling, named UEML, to serve as a basis for interoperability within a smart organisation or a network of enterprises".<ref>[http://www.ist-world.org/ProjectDetails.aspx?ProjectId=072ba8459dce4167a84182c016b32551 Unified Enterprise Modelling Language]. Accessed 29 Nov 2008.</ref>
