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The cost estimation of any software is a difficult assignment due to the involvement of many factors that anyhow affect the estimation process. In literature, many cost estimation models have been developed for more than a decade to maintain accuracy in estimation of the cost of software projects. But, it is found that these models are inefficient to estimate the exact cost of software development because of uncertainties and lack of accuracy associated with them. In this paper, Alla F. Sheta models have been taken for optimization, which are the modified versions of the very famous Boehm\u2019s COCOMO model. Parameters of the Sheta models have been tuned enough by the proposed method to estimate and minimize the consequences of different factors that affect the overall software development cost. Experimental work has been carried out in MATLAB environment and analysis of results is performed on the basis of Magnitude of Relative Error (MRE), Prediction (PRED) at 0.25, Value Accounted For (VAF) and Mean Magnitude of Relative Error (MMRE). Estimation accuracy of the proposed work is tested on NASA software project dataset. It is found that the proposed method shows good estimation capabilities over other state-of-the-art cost estimation models.<\/jats:p>","DOI":"10.3233\/jifs-169707","type":"journal-article","created":{"date-parts":[[2018,6,15]],"date-time":"2018-06-15T13:27:28Z","timestamp":1529069248000},"page":"1707-1720","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Improved software cost estimation models: A new perspective based on evolution in Dynamic Environment"],"prefix":"10.1177","volume":"35","author":[{"given":"Ashish","family":"Tripathi","sequence":"first","affiliation":[{"name":"Department of Computer Science and Engineering, SP Memorial Institute of Technology, Allahabad, India"}]},{"given":"K.K.","family":"Mishra","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering, Motilal Nehru National Institute of Technology Allahabad, India"}]},{"given":"Shailesh","family":"Tiwari","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering, ABES Engineering College, Ghaziabad, India"}]},{"given":"Naveen","family":"Kumar","sequence":"additional","affiliation":[{"name":"IIIT Vadodara, Gujarat, India"}]}],"member":"179","published-online":{"date-parts":[[2018,6,13]]},"reference":[{"key":"e_1_3_1_2_2","volume-title":"Software engineering economics","author":"Boehm B.W.","year":"1981","unstructured":"BoehmB.W.Software engineering economics. 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