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Our lives have depended on mathematical calculations from time immemorial (e.g. navigation tables) and advances in computational methods and in device technology have led to the applications of the ‘computer’ that pervade our lives. We accomplish a variety of missions with the help of such applications. An application whose correct functioning is critical to the success of a mission, is a mission critical application and the systems (hardware and software) used in running such an application are mission critical systems. An embedded computer system, in a car, controlling the braking function is an example of a mission critical system. The ability of this system to successfully detect adverse road conditions, driver’s braking behavior and apply the brakes is critical to safe driving in harsh environments like a snow storm. Its failure can result in catastrophe. There are many examples of mission critical applications. When we drive they control the engine of our car and traffic signals; when we fly they schedule and monitor the takeoff and landing of our plane and help it fly without crashing with any other plane; when we are sick, they may monitor and regulate our body’s vital functions; and when satellites are launched for space exploration, they monitor the complete mission. Such applications have to deliver valuable services on time. |
