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strategy dmu simulation conceptual modelling research supply chain management strategic management scor miles weaver phd government green leadership bus dmu open day whitehouse barack obama management theory maslow leicester business school motivation education learning he feedback management environmentalism natural environment environmental audit environmental impact http://www.slideshare.net/milesweaver/analysing-th external environment micheal porter pest analysis competitive analysis pestle strategic group activecitizenship social media endnote literature search research collaboration mendeley green business competitive advantage social enterprise greening supply chain mangement green strategy greening business