UNIT 7

• verification is a way of making sure data being entered into system is exactly matching source of data
• Verification methods: proof reading and double entry
• proof reading is once data has been entered it will be checked to see if it is correct
• Implementation techniques: phased implementation, pilot running, direct changeover and parallel running
• VALIDATION TECHNIQUES: presence check, range check, length check, type check and format chec
• presence check is to check if data has been entered
• range check is to check data entered is in correct range
• length check is to check if item of text is too short or long
• type check if to check if type of data entered is correct
• format check is to check if data has been entered in correct format
• a typical test plan would include: what is being tested, test data that will be used and expected outcome of test
• types of test data: normal data, abnormal data and extreme data
• SYSTEMS LIFE CYCLE: analysis, design, development, implementation, documentation and evaluation
• analysis is collecting info about present system and identifying problems
• design is designing new system to correct problems identified in analysis
• implementation is replacing old system with new system
• documentation is creating technical and user documentation for new system
• evaluation is evaluating whether new system meets requirements of design