*Result*: Quality improvement on reusability sub-characteristic of database stored program using ISO/IEC quality standards (Case study: Marketing system).

*Currently, the use of information technology plays an important role and greatly affects human life, especially in the business field such as the use of software in a company to support the company's business processes (financial management, marketing, and production). In its application, the quality used needs to be considered so that the software has better performance. Software quality is one of the important factors of the success of software. Software quality determines the extent to which a software product meets stated and implied needs when used under certain conditions. Information on the quality of software can be obtained through measuring software quality by applying software quality standards. In this study, internal measurements were carried out on stored procedures and functions of the Marketing System which aimed to measure the quality of the system. Quality measurement is carried out using software quality standards ISO/IEC 25010 and ISO/IEC 25023. The measurement parameter chosen is maintainability characteristics with 3 selected sub-characteristics: modularity, reusability, and testability. In the results of measuring the quality of the reusability sub-characteristics with 2 selected measurement points, the reusability of assets quality values (before and after refactoring) is 0.333 and coding rules conformity (before and after refactoring) are 0.4 and 1. The results of the reusability of assets measurement points show that 5 function packages are reusable in other packages. The results of the coding rules conformity measurement points obtained indicate that 9 packages do not comply with the coding rules for the system (before refactoring). After refactoring, improvements were made to the coding used so that an increase in the measurement results of coding rules conformity points was obtained. [ABSTRACT FROM AUTHOR]*