The reasons of information system evaluation before its implementation are:
• It provides the feedback necessary to assess the value of information and the performance of personnel and technology included in the newly designed system.
• The feedback helps in the readjustment of the part of the system if needed.
• The feedback helps in the adjustment of the future information systems development projects. The dimensions of system evaluation are: one is concerned about whether system is operating properly or not and another is concerned with satisfaction of user.