Firm size Large Medium Small Total
Number of firms contacted 19 8 6 33
Number of firms participating 5 4 4 13
Number of manager interviews 10 9 8 27
Number of operator surveys 15 12 9 36
Average no. of workers/division 700 138 10
Unionized/mixed work force 5 3 3 12
In house health and safety training 5 3 3 12
Construction sector