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    Portfolio management of software development projects means management based on an overall performance of the project set.To decide whether to bid for a contract, software cost estimation can provide a condition in a portfolio management. Specifically,available resources should meet estimated resources of the bidden project. Since estimation is carried out in an early stage with limited data,it is difficult to forecast a single correct value. Therefore, a range or a probability distribution is normally preferred. An approach of using probability distribution.
    To study benefits of portfolio management as a function of uncertainty levels, two portfolios are constructed. Probability distributions for all factors in the first and second portfolios are defined as normal and uniform respectively (for low and high uncertainties)




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