1, bottom-up
The "bottom-up" strategic design information system can avoid the risk of uncoordinated operation of large-scale systems, but its disadvantage is that it cannot be as complete and thorough as imagined. Because the development and changes of the situation have not been fully considered from the whole system in advance, many modules often need to be redesigned with the progress of the system.
2. Top-down
This strategy is difficult because it requires strong logic, but it is a more important strategy because integrity is the basic feature of the system. Although a system consists of many subsystems, they are an inseparable whole.
Extended data:
Basic idea:
The theories and methods of software engineering and system engineering are introduced into the research and development of computer systems. According to the principle of customer first, the system is analyzed and designed from top to bottom in a structured and modular way.
Specifically, it divides the whole information system development process into six independent stages, including system analysis, program design, system testing, operation and maintenance, and system evaluation. These six stages constitute the life cycle of the information system.
Baidu Encyclopedia-Management Information System and Its Development