Risk-based.approach.to.supply.chain.social.and.environmental.responsibility First-tier suppliers Second-tier suppliers HP will train first-tier suppliers to audit second-tier suppliers Third-tier suppliers HP and our first-tier suppliers will train second-tier suppliers to manage their suppliers Over suppliers introduced and/or assessed but not audited 18 new suppliers will be audited in 2010 153 suppliers audited through 2009; 43 will be re-audited in 2010 HP started our supply chain social and environmental responsibility (SER) program to make a real and lasting difference to the way our suppliers operate.