In this thesis, multiple intelligent robots working collaboratively using fuzzy logic for making decisions in order to maintain the security of an environment, inside or outside a building. Available information of environment is used to make intelligent decisions. The information consists of object locations, obstacles, intruder detection, etc. The action taken by an individual security robot depends on current surrounding situation, and internal states of the robot such as remaining battery life, and other aspect formulated as enthusiasm and motivation of the robot to engage in an activity. Activities consist of inspection, patrol, chase, guard, etc. This system is tested/simulated with several robots and shows the human-like decision-making. The system is demonstrated using a graphic environment where the movements of the security robots and intruder robots are shown
