System Analysis

System Analysis

1. Clockwise cycle

   • Fact Finding
     • Feasibility Study
       • Analysis Phase
         • System Design
           • Testing
             • Implementation
               • Documentation
                 • Evaluation
                   • Did the system met its objectives? Can it be further improved?
                     • The new system have to be assessed and suggestions and feedback form users should be taken into consideration for further improvements of the system.
                     • After testing is done successfully
                 • User documentation
                   • Used to explain to the user how to use the system. It is presented as a user guide to the user
                     • Items found
                       • -Screenshots of the user interface
                         • -Step by step instructions on how to launch and operating the system
                 • Technical documentation
                   • A report to allow users to alter/upgrade the system in the future. Troubleshooting can also be done
                     • Items found
                       • -System flowcharts
                         • -File structures
                           • -Pseudocodes
               • How the new system will be implemented
                 • Direct Implementation
                   • New system replaces the old system entirely
                     • Users will immediately enjoy the benefits of the new system.
                       • Advantage
                     • Users unfamiliar with the new system and will find difficulties coping the sudden change.
                       • New system may have major errors
                         • Disadvantages
                 • Phased Implementation
                   • Parts of old system slowly replaced by the new one. It will take a longer time in order to make sure every part works before the next begun
                     • System can be tested for errors before the full implementation
                       • Advantage
                     • Take a longer period of implementation which results in the full benefits being delayed
                       • Disadvantages
                 • Parallel running
                   • New system implemented alongside with old system to check whether it works. If new systems fails, old system will be a backup. After all problems solved, old system is discarded
                     • User can fall back on the old system if new system fails
                       • Advantages
                     • Since each job is done twice, there is more work for users when both system is running simulataneously
                       • Disadvantages
             • The process of testing is to check whether the new system functions works as expected with both normal usage and potential problems
               • Types of input data
                 • Normal data
                   • See if inputing correct values will achieved expected results
                     • Example
                       • If question request to input month
                         • The user will be required to type in any value range from (1-12)
                           • such as 4 for the month of April
                 • Abnormal data
                   • Check for validation and error-checking routines
                     • Example
                       • If question request to input month
                         • The user will be required to type any outside the range or unacceptable values
                           • Such as -5 which is not a possible month number
                   • Containing errors
                 • Extreme data
                   • To make sure validation works and calculations cope with a very large or small number
                     • Example
                       • If question request to input month
                         • The user will be required the edges of acceptable range such as the maximum or minimum
                           • Such as 1 or 12 which is acceptable as it represents January and December