Whichever suits your requirement we follows that:

• Water fall method
• Spiral method

Water fall method in order to design a good system, traditionally

As Management Information System as waterfall flows from the top to the bottom the system models shows the   development process from the top to the bottom in steps

• Mision And Goals
• Information Needs Specification
• Analysis
• System Design
• Process Design
• Testing
• Imolementation
• Maintenance

As water does not rise from a lower level to a higher level, it is presumed that once a step in the model is over, it is not required to go back. This model fits well when the changes into the requirement specifications are not required frequently. The minor changes can be taken care of through a maintenance process or through small design changes.
This model well applied for basic rule based data and information processing systems in Accounting Materials, Production and Personnel.

However, some systems are more dynamic and require changes in specifications more often to continue to be useful. Those modifications are termed as the versions of the basic model.