Policies of individual companies have a direct on costs. For example, some companies have particularly strict safety regulations, and these must be met in every detail. Accounting procedures and methods for allocating corporate costs vary among companies. Company policies with reference to labor unions must be considered, because these can affect overtime labor charges and the type of work that operators or other employees can perform. labor union policies may, for example, even dictate the amount of wiring and piping that can be done on apiece of equipment before it is brought into the plant and thus have a direct effect on the total cost of installed equipment.