Thus far, the most common certification in Guatemala and throughout Central America is stewardship chain certification, which includes monitoring and certification of the process of transforming the timber from the felling of a tree in the forest through to the preparation of the final product sold to consumers on the retail or wholesale markets. By 2007, the Rainforest Alliance had certified practices applied in 478,000 ha of the RBM, representing 60% of the multiple-use zone and 23% of the total area of the reserve. Nonetheless, the information obtained by consulting studies done previously in Peten by other institutions, and comparing them with data obtained in the interviews held during the technical visit, revealed that transport and fuel expenses weigh most heavily on the chain's production costs and significantly impair its competitiveness. This situation and the long distances that separate the forests from the industries, in many cases exceeding 100 km, significantly raise the cost of wood in the form of logs.