The Eco-S.A.T., the North American Green Purchasing Initiative's Self-Assessment Tool, allows buyers to evaluate their organization's overall environmental purchasing initiatives and identify opportunities for improvement. The document consists of a two-part best practices guide and a corresponding checklist.

The Eco-S.A.T. is designed for any organization with a structured purchasing system, including federal, provincial/state and municipal levels of government, hospitals, schools, universities, and large corporations.