What are the important points to do software design

The below points must be kept in mind when performing the design: 

i) Practicality: This ensures that system is stable and can be operated by a person of average intelligence. 

ii) Efficiency: This involvestimeliness, accuracy and comprehensiveness of system output. 

iii) Flexibility: The system could be modifiable depending upon changing needs of user. Such amendments must be possible with minimum changes.

iv) Security: This is a significant aspect of design and must cover areas of hardware reliability, fall back procedures, provision for detection of fraud andsecurity of data.