BCS Systems Design Techniques

Introduction

• Objectives and constraints of design
• The place of design in the systems development life cycle
• Using the products of analysis to drive systems design
• The work of the designer
• The scope of design
• Design methodologies
• Architectural issues in design
• Introduction to design patterns

User interface (UI) design

• Objectives of UI design
• Design of input and output interfaces
• Dialogue types
• Usability and style guides
• Prototyping the interface
• Modelling the user interface

Component-based design

• Introduction to components & software architectures
• Component design principles: cohesion, coupling, responsibility and reusability
• Using analysis models (use case diagram and class diagram) to create a logical component architecture
• Use case realisation with UML interaction diagrams
• Defining component interfaces
• Component engineering
• MVC (Model, View, Controller), choreography and orchestration design patterns

Logical data design (normalisation)

• Notation and conventions of relational data analysis (normalisation)
• Principles of progressive normalisation through first, second and third normal forms
• Rationalising results from normalisation of multiple data sources
• Building the normalised (Third Normal Form) data model
• Defining the final logical data design using Entity-Relationship Diagrams

Logical process design

• Activity Diagrams (UML)
• Structured English / pseudocode
• Data Navigation Diagrams

Physical design

• Optimising the logical design
• Principles of physical data design
• Principles of physical process design
• Design and architecture
• Packaging the design for delivery using Deployment Diagrams (UML)

System controls

• Risk in systems development
• Verification and validation of data
• Object controls
• Data controls & self-checking codes
• Function and state controls
• Visibility and encapsulation in object-oriented design (UML class diagrams)
• Audit trails
• Output controls
• Clerical controls
• Access controls, physical and logical security
• Backup and recovery
• Business continuity and disaster planning
• Legal requirements of the designer

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