It is not possible to describe a highly complex and dynamic process such as occupational health nursing simply in terms of core activities or tasks. Occupational Health Nurse (OHA) are constantly learning new skills, adapting current practices to meet new needs and developing new approaches to solving problems and therefore their practice is not static but is constantly improving based upon a core range of skills. However, within this limitation it is possible to describe those core areas of knowledge and competence that occupational health nurses use. The following list is not intended to be exhaustive, but rather to give an indication of the wide range of competencies that occupational health nurses demonstrate in practice. The Clinician Primary prevention The OHA is skilled in primary prevention of injury or disease. The nurse may identify the need for, assess and plan interventions to, for example modify working environments, systems of work or change working practices in order to reduce the risk of hazardous exposure. Occupational health nurses are skilled in considering factors, such as human behavior and habits in relation to actual working practices. The nurse can also collaborate in the identification, conception and correction of work factors, choice of individual protective equipment, prevention of industrial injuries and diseases, as well as providing advice in matters concerning protection of the environment. Because of the occupational health nurses close association with the workers, and knowledge and experience in the working environment, they are in a good position to identify early changes in working practices, identify workers concerns over health and safety, and by presenting these to management in an independent objective manner can be the catalyst for changes in the workplace that lead to primary prevention.