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Investment in this infrastructure ( as for recycling and composting infrastructure ) will be a function of policy initiatives to introduce cost recovery based on full cost accounting , " polluter pay " and " user pay " principles . She teaches in a number of modes , continuous entry , competency based , and trades training , and uses cooperative learning to build groups with a variety of abilities and knowledges into working entities for learning and development . Walker said that the first phase of the project was to develop a prototype based on a small subset of the data at the center . Under the revised protocol , responses to the missing items are imputed based on valid responses to other items in accordance with Bickel et al ., Guide to Measuring Household Food Security , Revised 2000 . COMPARABLE WORTH : Payment of wages based on the value of the work performed taking into consideration such factors as education , training , skills , experience , effort , responsibility and working conditions , This issue is raised particularly in comparing the salaries paid for occupations that are traditionally female to salaries paid for those that are traditionally male .