Abstract
The estimation of development effort and time is difficult for demanding real-time data communications software projects, where rapid response rates are critical in machine-machine communications. Applying popular cost models to estimate cost and time in three real-time data communications development projects showed that the development effort predictions varied from overestimation by a factor of 515 to an underestimation by a factor of 0.06. These results indicate that current cost estimation models may not be appropriate in estimating development effort for such software. Based on the distinctive features of data communications software projects, suggestions are made to modify the parameters of the function point model. Future research is essential to develop a more accurate model for these software projects.
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