The following paper examines the requirements of simulating post-conflict peace-building. In particular two NATO simulation tools, named ZETA and GAMMA, are the objects of investigation. The question is to which degree these tools are able to simulate the reconstruction of war torn countries and how they can be adapted to the needs of post-conflict situations. This seems to be of interest due to the changing role of NATO. The first part of the paper tries to create a criteria for evaluation. The central categories of post-conflict peace-building are identified and combined with the lessons learned from completed or ongoing peace-building missions. Eleven core findings are identified and rephrased into requirements. In the second part, these and requirements are compared with the tools under two different aspects: to which degree a simulation is generally possible and how many of the requirements can be fulfilled by the existing scenarios. The research comes to the conclusion that ZETA fulfils the general requirements for post-conflict peace-building simulation to a high degree. Only the linearity and the missing possibility to simulate more than one external actor are missing. The ZETA scenario already includes many of the required elements. However, coordination, the correct assessment of the time dimension and the missing dilemmas were criticized. Although GAMMA can not be used to simulate all aspects of peace-building and although behavioural change is not implemented, GAMMA seems well equipped to simulate important aspects of peace-building: security, coordination and the context-factors are easily implementable. The studied scenario did unfortunately not contain many peace-building elements. The paper comes to the conclusion that the most challenging task of future research to design functioning scenarios, may it be for the planning of missions, for the training of peace-builders or for the analysis and explanation for problems in ongoing missions, would be the development of methods and approaches to identify the important factors and agents, and to quantify their value inside the tools.