From the document: "The First Nations of Canada have been active over the past three decades in negotiating natural resources co-management arrangements that would give them greater involvement in decision-making processes that are closer to their values and worldviews... Through a review of the literature on TEK, I identified six “faces” of TEK, i.e., factual observations, management systems, past and current land uses, ethics and values, culture and identity, and cosmology, as well as the particular challenges and opportunities that each face poses to the co-management of natural resources."