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Membership Organization TNI Documents Administrative Committees Advocacy TNI Resources Management Oversight About TNI The NELAC Institute TNI is a 501c3 nonprofit organization whose mission is to foster the generation of environmental data of known and documented quality through an open inclusive and transparent process that is responsive to the needs of the community. The organization is managed by a Board of Directors and is governed by organizationalBylaws. Learn more. Standards Standard Interpretations and Guidance Expert Committees Resources Management Oversight About Consensus Standards Development The purpose of this program is to develop consensus standards for use by TNIs programs.