Definitions Likelihood L Score Consequence C Score Risk Score (L x C) Hierarchy of Risk Controls Rare (Monthly). 1 Minor - e.g., small cut, first aid treatment only 1 Elimination is a permanent solution and should be attempted in the first instance. Occasionally (Weekly). 2 Moderate - e.g., sprained ankle, one day off required 2 Substitution involves replacing the hazard or environmental aspect by one of lower risk. Frequent (Daily). 3 Major - e.g., loss of limb or bodily function 3 Engineering controls involve physical barriers or structural changes to the environment or process. Constant (Hourly). 4 Catastrophic - e.g., fatality and loss of life 4 Administrative controls reduce hazard by altering procedures and providing instructions. Personal protective equipment last resort or temporary control