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==External links==
*[http://www.diva-portal.org/diva/getDocument?urn_nbn_se_uu_diva-4275-1__fulltext.pdf A paper that includes the concept]
*[http://architectures.danlockton.co.uk Architectures of Control in Design, a site looking at constraints in the design of products, systems and environments]
[[Category:Technology]]
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