 In the same article, Etzkowitz and Leydesdorff use the notion of the triple helix of the nation state (government), academia (university) and industry to explain innovation, the development of new technology and knowledge transfer.Etzkowitz and Leydesdorff argue, "The Triple Helix overlay provides a model at the level of social structure for the explanation of Mode 2 as an historically emerging structure for the production of scientific knowledge, and its relation to Mode 1.