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TOC thinking process tools are unique in their ability to improve safety performance in enterprises where the heavy economic losses and casualties occur due to a variety of health and safety accidents. Safety management is a very complex system that includes human, machine management, and environmental factors. Therefore, it is challenging to improve safety performance. Thinking Process (TP) is a systematic thinking tool used to identify the core problem of a complex system. Firstly, the traditional Theory of Constraints TOC and TP are introduced. Secondly, the TOC for safety management is compared with the traditional TOC. Thirdly, a modified TOC thinking process for on-going improvement of safety performance is presented and the application procedures are given. Finally, an example for application of modified TOC thinking process is given.