The development of a large and complex POS integral management software system requires proper decomposition to reduce complexity, decrease development workload, lower development costs, and increase software productivity. One important aspect of this system is the implementation of integral failure handling, which is aimed at stimulating customer consumption. For members who have not made any purchases within a year, their integral points are cleared to encourage them to make new purchases. The data analysis module is another crucial component, which involves the calculation and processing of specific data such as sales amounts of products, in order to facilitate data analysis of various types of product sales for the business. As a commercial software, the error detection mechanism is of utmost importance. Therefore, during the module development, various real-world scenarios should be considered and appropriate measures should be taken. After the completion of program development, a Unit Check List (PCL) should be created and the software should undergo testing to verify its effectiveness, discover and repair defects, and improve software quality to ensure the development of a satisfactory product for users. Key words: POS integral management software system; integral failure; data analysis; Unit Check List (PCL)
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