The 2008 Basic Policy for the Promotion of Procurement of Eco-Friendly Goods and Services represents the framework for green procurement at the national government level. It defines evaluation criteria for 246 categories of products and services, up from 152 in 2002, including for materials and equipment used in public works construction. In 2007, Japan extended the green purchasing requirements also to the procurement of services. Nonetheless, many-local authorities have voluntarily implemented similar measures and subscribed the Green Purchasing Network's guidelines.