a. the equipment and layout of the work site and workplace; b. the arrangement, choice and use of work equipment and machinery, and how these are handled; c. the organisation of the work; d. the nature, degree and duration of exposure to physical, biological and chemical agents; e. unfortunate psychological strains that the work may entail; f. work operations that can overstrain the muscular-skeletal system; g. children and young people' level of training and instruction.