1. A project assessment system that assists to assess a project consisting of plurality of processes by computing forecast estimates of saidproject based on a set of information as starting information, progress information and up-to-date information of said project comprising: a computer process that computes, by using process planning information of said project, up-to-date actual progress information of said project and forecast model information of said project that defines estimates of variances of a plurality of parameters that are substantial measures of said project, at least one of estimation values of said parameters of said each process and another computer process that enables to assess said project by judging whether said estimation values satisfy a predetermined criterion or a result of a mutual comparison of said estimation values against each different process satisfies a predetermined criterion.