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Advanced Higher Computing Based on Heriot-Watt University Scholar Materials

Advanced Higher Computing Based on Heriot-Watt University Scholar Materials. Implementation and Testing. Lesson Objectives. Implementation, Testing, Evaluation and Maintenance. Implementation.

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Advanced Higher Computing Based on Heriot-Watt University Scholar Materials

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  1. Advanced Higher ComputingBased on Heriot-Watt University Scholar Materials Implementation and Testing Alford Academy Business Education and Computing

  2. Lesson Objectives Implementation, Testing, Evaluation and Maintenance Alford Academy Business Education and Computing

  3. Implementation This is the stage at which the software is coded, the user interface designed, hardware is set up and any legacy files are converted to the formats needed by the new system Coding Need to select a programming language in which to implement the code. The language needs to suit the problem: Procedural (Pascal, Comal, etc) Declarative (Prolog) Event Driven (VBasic, etc.) Alford Academy Business Education and Computing

  4. ATM VERIFY CARD ENTRY HANDLE MENU SELECTION HANDLE CASH AND RECEIPT OUTPUTS Testing Testing must be systematic – this means that it is carried out in a rigorous and structured manner. Large-scale system testing Modular approach breaks the large problem into smaller subsystems Alford Academy Business Education and Computing

  5. VERIFY CARD ENTRY READ USER ACCOUNT DATA CONTACT MAINFRAME ACCEPT OR REJECT CARD MESSAGE ACCESS MAGNETIC STRIPE DATA GET PIN NUMBER VERIFY ACCOUNT DETAILS Testing VERIFY CARD ENTRY SUBSYSTEM SUBSYSTEMS are coded and MODULES are tested independently Alford Academy Business Education and Computing

  6. VERIFY CARD ENTRY READ USER ACCOUNT DATA CONTACT MAINFRAME ACCEPT OR REJECT CARD MESSAGE ACCESS MAGNETIC STRIPE DATA GET PIN NUMBER VERIFY ACCOUNT DETAILS Testing VERIFY CARD ENTRY SUB-SYSTEM SUB-SYSTEMS are coded and MODULES are tested independently SUB-SYSTEMS are then integrated and the whole system is tested Alford Academy Business Education and Computing

  7. VERIFY CARD ENTRY READ USER ACCOUNT DATA CONTACT MAINFRAME ACCEPT OR REJECT CARD MESSAGE ACCESS MAGNETIC STRIPE DATA GET PIN NUMBER VERIFY ACCOUNT DETAILS Test Strategies Black Box Testing Without knowing the detail of the module code, test cases are built to test the inputs and outputs of the module. For the highlighted module, what test cases would you choose? Alford Academy Business Education and Computing

  8. validPin = false Do pin = inputbox(“Enter pin number”) if Len$(pin) < 4 then msgbox(“invalid pin”) elseif not Int(pin) then msgbox(“invalid pin”) else validPin = true Loop until validPin = true VERIFY CARD ENTRY READ USER ACCOUNT DATA CONTACT MAINFRAME ACCEPT OR REJECT CARD MESSAGE ACCESS MAGNETIC STRIPE DATA GET PIN NUMBER Test Strategies White Box Testing The structure of the code is examined and test cases are used to check that the logic of the code is correct. What test cases would you use here? Alford Academy Business Education and Computing

  9. Acquisition of hardware Upgrade to an existing system Purpose built site and completely new system Alford Academy Business Education and Computing

  10. Changeover Strategies How will the new system be brought in to replace the old system? Parallel conversion:- run the old in parallel with the new for a period of time until you are satisfied that the new system is reliable and error-free. Phased conversion:- Same as parallel only on a smaller scale. Run the new system in phases and as each is tested and is proven to be robust, introduce a new phase. Pilot conversion:- Restrict to a section of the old system – if the new section works then changeover. Direct conversion:- Immediately convert to the new system – also known as the ‘big bang’ Combined conversion:- Involves a mixture – some parts of the old system are immediately changed over while others are phased in or piloted Alford Academy Business Education and Computing

  11. Evaluation Key question – is the new system FIT FOR PURPOSE ie does it meet the original specification of the ORD and allow the client to operate successfully Methods:- questionnaires, interviews, observations, bring in consultants who specialise in evaluations, data logging. • Evaluation Criteria • the time it takes to install a piece of equipment • the number of errors an operator makes while doing a specific task • the time it takes an operator to complete a task • the number of times a computer crashes or hangs • the number of phine-calls made to a help-line • the number of times a user consults a manual Alford Academy Business Education and Computing

  12. Maintenance This comes into effect once a system has passed its ACCEPTANCE TEST Perfective – Adaptive - Corrective Preventive Maintenance:- deals with updating the system documentation and changing the structure of the software to ease future maintainability. Alford Academy Business Education and Computing

  13. Percentage Costs of Development Phases 3% 3% 5% 7% 15% 67% Alford Academy Business Education and Computing

  14. Activities • Answer Review questions 14-18 on pages 23 and 24 of the Scholar booklet • Do the End of Topic Test on pages 24 and 25 of the Scholar booklet • Homework – Read pages 19-23 of Scholar booklet and begin to prepare your own summary notes – you may wish to copy some of the text and diagrams from the Scholar website Alford Academy Business Education and Computing

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