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Software development effort prediction is one of the most challenging activities in software project management. There are several cost/effort estimation models which have been proposed over the years and still no model can accurately estimate the effort required to develop the software product. Each method has their own pros and cons in estimating development cost and effort. Estimation of efforts in the early stages is all the more difficult and that is because project data, available in the early stages of project is often incomplete, inconsistent, uncertain and unclear. Although data is incomplete and inconsistent but then also there are enough information present which makes it possible to estimate the effort at early stages.
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