A method for estimating software development effort comprises the steps of: generating a database containing a plurality of source softwares; calculating the Grey relational coefficients between the software to be developed and a source software in the database for each feature they exhibit; calculating the weights for each Grey relational coefficient; multiplying each Grey relational coefficient with the corresponding weight; calculating the Grey relational grade by summing up the products produced in the multiplying step; calculating the Grey relational grades for all remaining source softwares in the database; and comparing the Grey relational grades to estimate the effort for developing the software to be developed.
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