Object Oriented Design - Lecture 2: Strategic Planning and Related Design

This post is the note of lecture 2 of the course "Object Oriented System Analysis and Design". Videos can be viewed at https://www.youtube.com/watch?v=ODeQ0rF59kI&index=3&list=PL6XklZATqYx9dj72MKG6wLYjljeB2odra.

Lecture 2

1. Planning method - strategic planning

1. Definition of the technology architecture (infrastructure)
1. the set of computing hardware
2. network hardware/topology
3. system software employed by the organization
2. Application architecture
1. information system, subsystem, supporting technology
   e.g. update the RMO system due to customer expectation, modern technological capability, etc.
   [What we have]
1. Supply Chain Management System (SCM)
   (5 years old, Java/Oracle, tradeshow system will interface with SCM)
2. Phone/Mail Order System
   (12 years old, Visual Studio/MS SQL, reached capacity, minimal integration)
3. Retail Store System
   (order package solution, minimal integration)
4. Customer Support System (CSS)
   (web-based system, etc)
2. Information Diagram
   

2.Analysis, understand the details of the problem

1. Gather detailed information (interviews, questionnaires, etc.)
2. Define system requirements: modeling functional/non-functional requirements.
3. Prioritize requirements.
4. Develop user-interface dialogs.
5. Evaluate requirements with users.

 Define system requirements (FURPS+)

1. Functional requirements: APIs that should be implemented in the system.
2. Non-functional requirements:
1. Usability requirements: how easy it is to use the system (UI). (Need to consider whether the user can be trained.)
2. Reliability requirements: reliable for the day and night? or just day?
3. Performance requirements: response time, etc.
4. Secure requirements: encryption, etc.
5. + more other categories.

 Models and Modeling

1. After collecting information, create models which can be:
1. Textual models
2. Graphical models -  diagram, schematic
1. use case diagram
2. class diagram
3. sequence diagram
4. common diagram
5. state machine diagram
3. Mathematical models