The United Nations, including its many affiliated agencies, recognize their own responsibilities in contributing to more sustainable patterns of development, maintaining a market behavior which is credible, inspirational and exemplary, and proving that UN agencies stand behind the principles they promote. Through the development of procurement criteria that support sustainability principles, requisitioners and procurers can send strong signals to the market in favor of goods and services that promote sustainability. The United Nations agency destined to develop and promote resource efficiency and more sustainable consumption and production processes, including the promotion of sustainable resource management in a life cycle perspective for goods and services in both developed and developing countries, The United Nations Environmental Programme, UNEP, drafted sustainable public procurement implementation guideline to aid in the consideration of society, economy, and the environment in procurement processes.