Identification of Noise Sources. The NRA process begins with identifying excessive noise sources in the workplace. This should be done annually by employers in their workplace through the Appendix 1 of ICOP for Management of Occupational Noise. Once excessive noise have been identified in any work area, a Noise Risk Assessment (NRA) must be done by a DOSH Registered NRA Competent Person. 

1. Noise Exposure Measurement. NRA involves measuring noise levels at various locations within the workplace. 
2. Worker Exposure Assessment. NRA assesses the extent of individual worker exposure to noise, taking into account the nature of their tasks, the duration of exposure, and the adequacy of hearing protection.
3. Control Measures. Based on the NRA findings, control measures are recommended to minimize or eliminate exposure to excessive noise. These measures often include elimination, substitution,  engineering controls, administrative controls, and the use of personal protective equipment (PPE), such as hearing protection devices.
4. Regular Monitoring and Review. The NRA requires an annual review of its accuracy to ensure that control measures remain effective and adapt to changes in work processes or noise sources. If there are no changes in the nature of operations, each NRA is valid for no longer than 5 years.