Nowadays, there is a growing need for Management Systems to manage various autonomous systems. These Management Systems are difficult to test, since their functionality includes exchange of information with various devices and applications via the network communication. There is a need for efficient methods of development and testing to minimize development time and cost. The solution suggested in this paper is an Offline Simulation Model, where the simulation and the tested Management System are placed on the same computer. This model decouples the testing of the functional aspects of the developed Management System from the testing of the communication aspects. This method saves a great deal of human effort, and therefore reduces development time and cost.