[en] Particle accelerators are an important tool for new discoveries and understanding in different principles of all branches of science and engineering. As the science is progressing, new types of techniques are discovered and journey is still going on for new innovative techniques for acceleration, mainly in achieving accelerators for high energies, high currents and so on and uses of these machines in industrial application and nuclear energy generation and waste incineration. As accelerators increase in size and complexity, demands upon their control systems increase correspondingly. Machine complexity is reflected in complexity of control system hardware and software. Same time imposing easy access and operation of the machine with higher degree of reliability and reconfigurability. Model-based procedures and fast feedback based upon even faster beam instrumentation are often required. Managing machine protection systems with hundreds or thousands of inputs is another significant challenge. Increased use of commodity hardware and software introduces new issues of security and control. (author)