To manage iterative development of incremental software so that resource allocation and cost estimating can be reasonably finished in incremental software development
the man-hour of development must be measured.Incremental requirements in each phase are implemented according to stated probability which is regarded as task accomplishment rate
a measurement method of iteration periods in incremental software development is provided.Furthermore
the man-hour of development for whole software project can be forecasted.The method is demonstrated with an example.