Chapter 7: The system life cycle (Development & Testing (Development…
Chapter 7: The system life cycle
Analysis: Collecting information about the present system and identifying problems
Design: Designing a new system to correct the problems identified in the analysis.
Data Validation - checks whether the data entered data fulfils specific criteria to ensure the data is valid.
Different validation techniques
Proof Reading - Once Data has been entered it will be checked to see if it is correct (e.g. check is name is spelt correctly).
Double Data Entry - the same data is required to be entered twice (e.g. type new password twice)
Development & Testing
Development & Testing: Developing and testing new system.
Create the file structure
• Field Names • (To store specific data) • Set Specific Data Types
• Validation rules will ensure the correct data in entered into the fields.
• The user interface will allow the user to interact with the system and input data.
Data TestingNormal Normal data – data within a (given) range Example – 10% - 90%
Abnormal Abnormal data – data outside the range (limits) Example – Less than 0% or more than 100%
Extreme Extreme data – data on the boundaries of the range or at the limits of acceptability. Example – 0%-5% or 95-100%
Documentation: Creating technical and user documentation for new system.
Implementation: Replacing the old system with the new system.
Evaluation: Evaluating whether the new system meets the requirements of the design requirements.