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"Sigma has been particularly helpful for us in exposing us to the very best thinking on business and sustainability. Its focus on bringing practitioners together to share experiences on the reality of managing sustainability has been commendable. By producing a framework it has pointed business in a common direction but allowed each company to interpret the detail itself, reflecting the diversity of business model, product/service offer and customer base in the UK's economy in the 21st Century."
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Mike Barry
Sustainable Development Manager
Marks & Spencer
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