Glossary of terms and acronyms O-R The following is a glossary of some key terms, concepts and acronyms used in the publications in this and in linked web sites. The terms and definitions are drawn from a number of sources including legislation, standards, codes of practice, guides, reports and other documents. For translations into Maori of some of the key terms here, see the English-Maori Glossary of Occupational Safety and Health Terms . If you have any suggestions for additions to the glossary, please e-mail them to the webmaster . [Aviation industry] All fixed and mobile objects, or parts thereof, that may obstruct either the movement of an aircraft on the ground or protrude into an aircraft's takeoff or landing path. Objective A statement that indicates how the goals can be achieved. Occupational asthma A disorder characterised by bronchial hyper-responsiveness (BHR) or variable airflow limitation related to workplace exposures. Many hundreds of occupational agents, including some inorganic and organic dusts, have been associated with occupational asthma. Biological agents include grains, flours, plants and gums, fur, feathers and other animal parts, insects and fungi, drugs and enzymes, and various types of wood. Chemical agents include chlorofluorocarbons, alcohols, metals and their salts, and welding fumes. Occupational cancer Cancer caused by an agent in the workplace, e.g. asbestos, benzene. Occupational diving Diving performed in the course of employment for gain or reward (irrespective of whether or not diving is the principal function of employment or merely an adjunct to it). Occupational health The