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During the first 15 years of the 21^st Century, the Swedish commitment to the Neutral Nations Supervisory Commission, NNSC, went through a thorough change of the mission. This took place especially during the years 2004-2015. The transformation of an ongoing mission, with deeply rooted traditions is a big challenge. How were these changes conducted and the Expanded tasks implemented?

This thesis strives to explain the development of the Swedish NNSC delegation, and the introduction of the Expanded Tasks, which has comprehensively transformed the commitment.  The ambition is to do this with the support and background from Allison/Zelikow´s explanatory models of decision theories. Their book Essence of Decision gives a good background to different models, out of which I have chosen one, to put the effort into explaining the NNSC development from their description of the Rational Actor Model.

The findings from this work show that a number of events affected the outcome. Parallel to world scene events, ongoing effort and work duties were already under process within the NNSC delegations, with support from their capitols. Several actors were striving to commit the NNSC to more suitable tasks. This was done with the ambition to better fulfill the role of an active component in accordance with the Armistice Agreement. The thesis shows that it has been rational motives from several organizational and state actors involved. These rational factors have had a clear influence on the way ahead with the implementation of the NNSC Expanded Tasks into a more modernized context for the Commis