Abstract
In the software development project, it is one of the important factors for success to estimate the project size appropriately. However estimation by SE s with their intuition and experience brings big difference in many cases. To reduce this difference, there is the function point (FP) method as one of objective and necessary estimate techniques. Authors have verified and considered what is necessary to bring the FP measurement value of the software project size close to the result value at the completion. In the number of projects of the manufacturing industry system, the project size was measured with the function point of simple and easy means and the measurement accuracy was calculated at the project completion stage. Moreover, in another project, the project size was measured with the function point of simple and easy means several times between the initial stage and the completion stage according to the progress of the project, and the measurement result was verified. As a result, we establish the verification method to improve the estimate accuracy, and we calculate the coefficient to bring the result of the measurement by the estimated function point count close.
