Abstract: Respective items of a software component, a development task and a required specification, which are enumerated as the requirement for performing the development of software products belonging to a certain category are first registered in recording means. In the registration of the development-task items, when a specific development-task item can be initiated only after the completion of one or more other development-task items at the time of the registration, the specific development-task item is registered together with ordinal information specifying the one or more other development-task items. Then, the operator is allowed to set up the correlations between any two of the software component, the development task and the required specification which have been registered by the item registration function, with respect to each of the items thereof, and information about the correlations is registered in the recording means.

Abstract: Informations about design specifications, components, design items, the correlations between the design specifications and the components, and the correlations between the design items and the design specifications or between the design items and the component, which are required for designing a product, are registered in a database while giving given definitions to the informations on a computer. A computer is used to prompt a design engineer to determine the content of the design specification with respect to a specific version of the product, and to extract components for the specific version from the database in accordance with the correlations between the design specifications and the components and present the extracted components to an engineer so as to prompt the engineer to determine components required for the specific version.

Abstract: Respective items of a software component, a development task and a required specification, which are enumerated as the requirement for performing the development of software products belonging to a certain category are first registered in recording means. In the registration of the development-task items, when a specific development-task item can be initiated only after the completion of one or more other development-task items at the time of the registration, the specific development-task item is registered together with ordinal information specifying the one or more other development-task items. Then, the operator is allowed to set up the correlations between any two of the software component, the development task and the required specification which have been registered by the item registration function, with respect to each of the items thereof, and information about the correlations is registered in the recording means.

Abstract: Informations about design specifications, components, design items, the correlations between the design specifications and the components, and the correlations between the design items and the design specifications or between the design items and the component, which are required for designing a product, are registered in a database while giving given definitions to the informations on a computer. A computer is used to prompt a design engineer to determine the content of the design specification with respect to a specific version of the product, and to extract components for the specific version from the database in accordance with the correlations between the design specifications and the components and present the extracted components to an engineer so as to prompt the engineer to determine components required for the specific version.