A good way to do this is to have clear procedures around processes in your organization, from purchasing, manufacturing and business until the product is used by your customers. These procedures should be embedded in your management system.
Although Product Stewardship is an voluntary initiative in the chemical industry a good framework also includes all regulatory requirements, clear accountability and responsibility in your organization and provides clear ways of responsible working for your customers.
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There is a description on Product Stewardship on Wikipedia and adopted by many companies although the focus on the different stages of PS sometimes differ.
Product stewardship is an approach to managing the environmental impacts of different products and materials and at different stages in their production, use and disposal. It acknowledges that those involved in producing, selling, using and disposing of products have a shared responsibility to ensure that those products or materials are managed in a way that reduces their impact, throughout their lifecycle, on the environment and on human health and safety.