PURPOSE: To completely extract the related changes by relating the items of a structured manual to the software specifications and storing these items in a relational data base.

CONSTITUTION: Four types of masters, i.e., a function item master (a), a specification master (b), a user master (b), and a module master (d) are registered and then connected to each other on a relational data base. Thus the matrix tables like the specification/module and user/module matrices, etc., can be easily prepared. Then it is possible to quickly and surely perform such manual control operations as the correction of a related manual in response to the change of specifications, the information of the correction, the distribution of the correction versions, etc.