design & implementation

design & implementation

1. executable system & invariably interleaved

2. process stage

   • define the context and mode of use of the system
   • design the system architecture
   • identify the principle
   • dev design model
   • specific obj interface

3. design model?

   • to show the relationship bet obj & obj classess
   • static model
     • static structure of the system
   • dynamic model
     • dynamic interactions
   • subsystem model
     • organize logically
   • sequence model
     • sequence of the model interaction
   • static machine
     • respond to the different service request

4. design pattern elements

   • name
   • problem des
   • solution des
   • consequence

5. design problem

   • observe pattern
   • facade pattern
   • iterator pattern
   • decorator pattern

6. implementation issues

   • reuse-existing system
     • cost higher
   • configuration management
     • changing software system
     • problem tracking
   • host target development
     • develop on one computer
     • does not usually execute