07. RESPonSiblE PuRchaSES and ouR commitmEnt to thE EnviRonmEnt annual REPoRt 2011 Presentation of the Mochila Ligera Campaign, a Santillana publishing initiative aimed at reducing the weight of schoolbags We believe that our relationship with our suppliers is a key factor in acting as a socially responsibly company. that is why we are actively committed to managing our resources in a way that will minimize the impact of our operations on the environment. We expect the same commitment from all our suppliers and collaborators. our Guide to Relations with Suppliers outlines the relationship between PRiSa and our partners. the Guide is informed by the principles of objectivity, transparency, non-exclusivity and equal opportunities, and evaluates not only economic factors and product and service quality, but also the suppliers’ degree of compliance with their national legislation as well as their commitment to tax, labor, human rights and environmental obligations. 101