Desirable Characteristics of a Design

• Minimal complexity
• Ease of maintenance
• Loose coupling
• Extensibility
• Reusability
• High fan-in: High fan-in refers to having a high number of classes that use a given class.
  High fan-in implies that a system has been designed to make good use of utility
  classes at the lower levels in the system.
• Low-to-medium han-out: Low-to-medium fan-out means having a given class use a low-to-medium number of
  other classes. High fan-out (more than about seven) indicates that a class uses
  a large number of other classes and may therefore be overly complex.
• Portability
• Leanness: Leanness means designing the system so that it has no extra parts
• Stratification: Stratification means trying to keep the levels of decomposition stratified so
  that you can view the system at any single level and get a consistent view.
  Design the system so that you can view it at one level without dipping into
  other levels.
• Standard techniques