Calculation of the price is generally based on the source word. The cost of a translation is thus the result of the total number of words times the price for the requested language combination (English into French, for example). Other costs for additional services can be added to this minimum base price. Such services can include word processing, review, proofreading, special layout, certification of certified translations, and other. In all cases, the cost of the translation project is always established on a case by case basis.