工业工程专业英语Chapter 9.ppt

Code design Code design means carrying on the specific code design according to the code system of replacing the Chinese characters with the characters and the numerals determined in system analysis. The concrete contents include: Code structural design The use scope, the deadline and service revision jurisdiction Code table establishment Input design The accuracy of input data plays the decision role in the overall system quality. Improper input design may cause the mistake of the input design. Even extremely correct computation and processing will not definitely obtain the correct output. There is a maxim in computer profession the input is trash, the output is also trash. Therefore, the input design must both provide the convenience interface to the user and have the strict inspection and error correction function in order to reduce the possible mistake as far as possible. At the same time, try to use the automatic input way like bar code input, the on-line monitor and so on as far as possible. Output design Because output relates to the users directly, therefore the design starting point is to guarantee the output achieves the user’s requests, reflects and organizes each kind of useful information correctly. At the same time, improve enterprises report form transmission means and reduce the printing report form as far as possible by this. And enhance the working efficiency by using electronic form transmission means. Database design The database design mainly includes the logical design and the physical design of the database in the system design stage. It requires synthesizing the output design and the data demand of each enterprise department. By analyzing the relations between each data, according to provided functions and description tools, design the data model with suitable scale, few data redundancy , high withdrawal efficiency, which also can reflect the data relations correctly and satisfy many kinds of inquiries request. Systems reliability design