Because EPR is not prescriptive about implementation, it provides incentives for businesses to voluntarily reduce packaging and get innovative with materials and design.

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Thus the guidelines are not prescriptive in nature, but are suggestive to facilitate knowledge-based decision-making to adopt OA policies and strengthen national research systems.

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"Mortality really is scheme specific and too prescriptive a trigger will not fit that very comfortably, " said James Wintle of Watson Wyatt.

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She said the health secretary's duties as currently defined in the bill were "neither prescriptive nor exhaustive" and therefore the amendment "would not give the secretary of state a new power to do anything that the clause does not already accommodate".

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Mr. Cameron rightly argues that EU regulations are often overly-prescriptive and that, by extending into areas such as employment rules not strictly necessary for the maintenance of a single market, have become a growth-sapping burden on European business.

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Given that the competition is around judging plans for innovation, not the actual results of the innovation, those measurements must focus on inputs built around tightly prescriptive theories of change.

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