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Of course, there are also the practical matters of cost and enforceability that must be factored into any setup of marine protected areas. Creating a layout for Marine reserves that optimizes these numerous biological, physical, and social factors is a complex issue. Fortunately, there exist several environmental modeling packages such as Marxan (Possingham, Ball, & Andleman 2000), ResNet, and C-Plan that use stochastic statistical methods to optimize these parameters. Naturally, these types of algorithms are effective only given proper dataonly as accurate as the data put into them, so continued emphasis on the collection of scientific data is essential. (Hyperlink to EXTERNAL FURTHER RESEARCH PAGE).