A construction work is one of the most complicated targets due to its nature and characteristics. The Management Board of the construction organization and the Employer often work at the office far from the target and they are infrequently present at such target. Meanwhile, the Management Board mainly consists of engineers, technicians and supervisors. A construction work is basically executed by subcontractors of various packages and items, so it’s very difficult to oversee materials and workers. Workers are unskilled labor who do seasonal jobs and receive weekly wages. Number of workers are not fixed and their positions and accommodations are not stable. The unskilled workers of a construction work have higher income and do heavier jobs than those of other industries. They rest in provisional places, even at the job site, so they usually drink beer or wine, leading to fighting, disturbance, gambling or thief. When a construction work is under operation, fencing wall,...

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