Answer to Question 1
PtD causes designers to think through what workers will actually have to do in constructing the permanent features of a structure. If any aspect of the design creates a hazardous condition the design is altered to eliminate or mitigate the condition.
Answer to Question 2
Heinrich's theory has two central points: 1) Injuries are caused by the action of preceding factors; and 2) removal of the central factor (unsafe act/hazardous condition) negates the action of the preceding factors and, in so doing, prevents accidents and injuries.
Traditional Chinese Medicines Reveals Legality Issues and Health Safety Concerns
Structure of a generalized synovial joint.
Basic structure of the autonomic pathway
Structure of molybdenum-dependent nitrogenase from Azotobacter vinelandii
Crystal structure of a synthetic Holliday junction
Three Types of Lipids The three types of lipids vary in structure