Companies with advanced supplier management programs care about the sustainability of their own suppliers and their supplier's suppliers, or “tier 2” suppliers. Companies can influence tier 2 or tier 3 suppliers by including them in the requirements of their direct (tier 1) supplier's standards. Or they can insist that all suppliers hold their suppliers to the company's supplier code of conduct. Herman Miller, for example, expects its tier 3 suppliers to follow its strict requirements regarding any materials or chemicals that will wind up in Herman Miller products. As Paul Murray, Director of Environmental Affairs and Safety at Herman Miller, reports, “We reach down to 4th and 5th tiers at times to find the chemical formulas