Abstract
The "development scale estimate" of IT development project is a field underdeveloped also in the long history of software engineering. Although it is thought that various backgrounds exist in it, having shown "the total development amount of money" only on the standard of "man-month" and a "personnel unit price" backfires, and it has become competition of only a price. Absolutely, even if who estimates, you should estimate the portion of this expense almost similarly to be the expense of IT development project. And it is desirable to add expense as added value, such as a guarantee of quality and project management, to the estimate, and to compete. Then, in this paper, since the method of intelligible "development scale estimate" was packed in based on the experience for 30 years of a writer. and it is improved and established all together like the freeware of software, details are made opening.
