Package Diagrams

Question 1

Two main goals for packaging

Answer 1

1. Improve reasoning about and navigation through the project
2. Isolate change

Question 2

Two general approaches for packaging

Answer 2

1. by layer
2. by feature

Question 3

Package by layer

Answer 3

• Organize packages according
  to the types of classes and the
  technical responsibility they
  have, e.g., UI, business logic,
  data persistence, etc.
• Advantage: easy to understand, easy to navigate for small projects
• Disadvantage: not good at isolating change

Question 4

Package by feature

Answer 4

• Organise packages according to their domain-related functionality
  → functional cohesion
• Advantage: very good at isolating change
• Disadvantage: only easy to navigate if you know the domain well
• Strongly advised for larger
  projects!