if the user resist against the new system then the user does not want to interact with the new system thus both the user and the system will not deliver as expected.
paul lutaaya kimbowa&ddungu rebecca
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-when user request are not clear -when few user involve in the system -when design are complex and require concrete form -history communication problem between user and analyst
user interface
User System Interaction was created in 1995.
In single user there will no confusion in computer system .It is easy to use .The posibility of damaging the system is less .In single user only one user can use the system at one time
The 'shell' is a user interface program that interfaces between a user of the system and the Operating System. It is the user interface.