The software cost estimation aims to predict the most realistic effort that is\nrequired to finish a software project and so it is critical to the success of a\nsoftware project management. A Software Cost Estimation affects nearly all\nmanagement activities, including project bidding, resource allocation and\nproject planning. It is affected by a number of factors, such as implementation\nefficiency, as well as how much the various reviews and studies completed\nprior to the software development stage cost. Accurate cost estimation will\nhelp us to complete the project on time and within budget. Accurate estimation\nis important because it has led to extensive research into the methods of\nsoftware cost estimation. Some important software cost estimation methods\nhave been studied in this research work. In addition, we have set out own criteria,\nwhich has been used to compare all the different selected methods. We\nhave also given a score for each evaluation criteria, so that we can compare the\ndifferent methods numerically for cost estimation. Our observations have\nshown that it is best to use a number of different estimating techniques or cost\nmodels, and then compare the results before determining the reasons for any\nof the large variations. None of the methods are necessarily better or worse\nthan the others. We found, in fact, that their strengths and weaknesses often\ncomplement each other. Therefore, the main conclusion is that there is no one\nsingle technique that is best for every situation, and the results of a number of\ndifferent approaches need to be carefully considered to discover what is the\nmost likely to produce estimates that are realistic.
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