Abstract: The subject matter is directed to a software modification estimate method and a software modification estimate system that make it possible to assemble a modification development plan prior to modification work on existing software. The software modification estimate method and the software modification estimate system are provided with an input and output means (1) that inputs and outputs information on the modification of existing software, a modification estimate calculation means (2) that analyzes a modification requirement based on the information received from the input and output means and numerically calculates the fluctuation of productivity in the modification, and a database (3) that stores data necessary for the analysis and that holds the analyzed result. Thus, it is possible to estimate total steps required for the modification of the software at a preparation stage.

Abstract: A software development production management system having a processor, which is enhanced in reliability by reducing a different between an evaluation of an actual development and a formed plan. A management database holds both development process component data necessary to model a development process of software and estimation parameter data used to estimate a development plan of the software. The software development production management device compares and evaluates, upon completion of the software development, an actually performed development process and the previously created software development plan, and makes a correction to the estimation parameter data as needed to feed details of the actually conducted software development back to the next development plan.

Abstract: Provided is a software development production management system, which is enhanced in reliability by reducing a difference between an evaluation of an actual development and a formed plan. A management database (3) holds both development process component data necessary to model a development process of software and estimation parameter data used to estimate a development plan of the software. A software development production management device (1) defines a software development process to be managed by consulting the development process component data held in the management database (3), and uses the estimation parameter data to create a software development plan from the defined software development process.