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A study of English Nature's Accessible Natural Greenspace Standards model investigated whether such a model is needed; barriers and limitations to its adoption; and means of implementation. It was concluded that English Nature should improve communication with local authorities, and that greenspace planners and managers need effective decision support in implementing the model. Also many of the difficulties associated with the model arise from its attempt to combine two very different perspectives: that of nature conservation and that of greenspace users.
Pauleit et al. (Sun,) studied this question.