PRODUCTION OF SOFTWARE PARTS

PROBLEM TO BE SOLVED: To provide a method which improves the reusability of data items and functions that are important for succession of the existing software property, improves the productivity for development of software and also improves the reliability and quality of the work specifications. SOLUTION: In the steps 1 and 2, a source program is analyzed and a data parts consisting of one or more data items is obtained. In a step 4, a procedure block which produces the data item value of the produced data parts is extracted out of the analyzed program based on the identification information that is previously set and secures the correspondence between the data item and procedure stored in the data parts and those of an existing program. In the steps 5, 8, 9 and 10, the data item names included in the extracted procedure block are changed together with the change to a procedure which refers to and generates other data parts and the change of a procedure which transfers the control to another procedure block and the contents of these changes are stored in the data parts.