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Selection criteria The resources included here have been selected because of 1 ) the way the subject material is presented and covered , 2 ) the quality , currency , and accuracy of the content , 3 ) the level of usability of each resource , and 4 ) the level of specialization in each resource . A strong direct product theorem says that if we want to compute k independent instances of a function , using less than k times the resources needed for one instance , then our overall success probability will be exponentially small in k. The WNC Alliance has developed a community planning toolkit that gives citizens , planners and decision makers the resources they need to work towards the implementation of smart growth practices , sustainable land use and more livable communities .