System Design

What is a system ?

adapted from Bennett et al.

Model

A model is a simplified representation of the world (or part of a software system) from a specific view.

• Simplified: Not the entire system
• Representation: Notation used.
• View: aspect modelled.

UML (Unified Modelling Language)

• In UML mostly diagrams are used as a representation to define models.
• UML diagrams are unambiguous. in contrast to natural language.

UML Diagrams Taught

• Data
  • Class Diagram
• Functionality
  • Use Case Diagram
• Behavior
  • Activity Diagram
  • State Machine Diagram
• Interaction
  • Sequence Diagram

Definitions

Term	Definition
Design	Modelling how the various parts of a system will work together
Analysis	Finding out what the system should do and how the different system parts are related to one another

Approaches to Software Development

• Waterfall
• Scrum
• Kanban
• Extreme Programming