Quality and environmental Agreement. 3.1 The supplier´s quality management System The Supplier will manufacture and inspect contractual items according to the rules of the required quality management system and the current state of the art. The supplier commits to safeguard the quality of the products supplied to KRONE by applying and maintaining, under their own responsibility, a quality management system based on DIN EN ISO 9001 and certified by an accredited certification company, or by permanently adopting and proving such a system up to an agreed date. As an alternative to this arrangement, KRONE suppliers can be classified as approved suppliers if the Supplier demonstrably meets the requirements of the authorizing departments (Purchasing, Technical Development, Overall Logistics, Quality Management, etc.) (e.g. through an audit). The Supplier must develop its sub-suppliers’ QM system with the aim of ensuring that these sub-suppliers fulfil its requirements in terms of DIN EN ISO 9001. If the Supplier receives advance supplies (materials, software, services, production and/or testing equipment) for quality management purposes and/or to manufacture the contractual items, the Supplier will safeguard the quality of such advance supplies either by its own resources and/or by contractually integrating the sub-supplier into the Supplier’s quality management system.