Sad_Ms_March_11

INTERNATIONAL ADVANCED DIPLOMA IN COMPUTER STUDIES MODULE: SYSTEMS ANALYSIS & DESIGN ASSIGNMENT TITLE: HERITAGE RAILWAY MARCH 2011 MARKING SCHEME Markers are advised that unless a task specifies that an answer be provided in a particular form, then an answer that is correct, factually or in practical terms, must be given the available marks. If there is doubt as to the correctness of an answer the relevant NCC Education textbook should be the first authority. This Marking Scheme has been prepared as a guide only to markers and there will frequently be many alternative responses which will provide a valid answer. Each candidate’s script must be fully annotated with the marker’s comments, where applicable, and the marks allocated for each part of the tasks. Throughout the marking, please credit any valid alternative point. Notice to Markers Where markers award half marks in any part of a task they should ensure that the total mark recorded for a task is rounded up to a whole mark. Systems Analysis and Design March 2011 Final  NCC Education 2011 Note:   Markers should be aware that there are several ways to model the system . For full marks candidates should include the features that ensure the system can meet the needs of future expansion, e.g. recording the name of the owner of engines so that extra engines can be borrowed or hired and allowing for new timetables and ticket types. Guide Maximum Marks Task 1 Looking for:  Ability to model system functions using OO techniques.  Functional Model for system including: o Use case diagrams – use cases should match activities o Use case specifications – should match use cases in diagram o Activity diagrams System Use Case Diagram 6 6 6 18 Top- Level Activity Diagram Systems Analysis and Design March 2011 Final  NCC Education 2011 Add Journey Activity Diagram Add Ticket Type Activity Diagram Systems Analysis and Design March 2011 Final  NCC Education 2011 Add Customer Activity Diagram Sell Ticket Activity Diagram Systems Analysis and Design March 2011 Final  NCC Education 2011 2 Looking for:  Ability to model system structure using OO techniques.  Structural Model for system including: 5 o Fully completed class diagrams o With attributes and operations included (accept most of detail on 10 CRC cards if done that way) Class Diagram 15 3 Looking for:  Ability to model system behaviour using OO techniques. March 2011 Final  NCC Education 2011 Systems Analysis and Design  Behavioural Model for system including: o Sequence diagrams o Behavioural state machines o Communication diagrams Sequence Diagram Add Journey 8 5 5 18 Sequence Diagram Add Customer Sequence Diagram Add Ticket Type Systems Analysis and Design March 2011 Final  NCC Education 2011 Sequence Diagram Sell Ticket Ticket State Machine Systems Analysis and Design March 2011 Final  NCC Education 2011 Engine State Machine Communication Diagrams should match the sequence diagrams but with the emphasis on which object/actor is in control of messages rather than message sequence (see textbook). 4 Looking for:  Discussion of data protection issues: o Laws, regulations and best practice o Application to new system o Methods of ensuring adherence to best practice 4 4 4 12 5 Looking for:  Detailed discussion of forgery/copying issues and how they will be 5 dealt with 5  Allow customers to select multiple tickets of different types  Discussion of hardware and paper requirements for printing tickets and 5 labels including recommendation and costing 15 Looking for ability to design the system database: a) A set of fully normalised tables with detail showing the normalisation 6 process for each. b) Data Dictionary with entries for all elements of the design. 6 12 6 7 Looking for comparison of OO methods with structured methods:  Comparison of methods  Advantages & disadvantages of both  Examples based upon new system Looking for:  Clearly presented documentation which is comprehensive  2 2 1 5 8 5 5 Total 100 Marks Systems Analysis and Design March 2011 Final  NCC Education 2011 Learning Outcomes Matrix Module Objectives (LO) Assignment Activity Task 1 - OO functional model Task 2 - OO structural model Task 3 – OO behavioural model Task 4 – Data Protection Task 5 – System Output Task 6 – Database and data dictionary Task 7 - Comparison of design methods Task 8 – Documentation 1, 2, 3, 4, 5 1, 2, 3, 4, 5 1, 2, 3, 4, 5 2 5 3, 4 1 4 Systems Analysis and Design March 2011 Final  NCC Education 2011