1 An Introduction to Object-Oriented Analysis Objects and UML in plain English. Chapter 6: The Object-Oriented Development Life Cycle Srividya Srinivasan

2 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.1. The Life Cycle   6.2. The Object-Oriented Analysis Phase   6.3. The Object-Oriented Design Phase   6.4. The Construction Phase   6.5. The Object-Oriented Testing Phase  6.6. The Maintenance Phase

3 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.1. The Life Cycle l The OODLC is an update of the older SDLC l In this chapter we will overview the OODLC l Beginning in Chapter 7 we will look at detailed step-by-step methods for doing the Analysis Phase. l The aim in this chapter is to see how all the pieces fit together. l We examine the Analysis Phase in detail since it is the focus of this course.

4 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.1. The Life Cycle

5 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.1. The Life Cycle 6.2. The Object-Oriented Analysis Phase   6.2. The Object-Oriented Analysis Phase   6.3. The Object-Oriented Design Phase   6.4. The Construction Phase   6.5. The Object-Oriented Testing Phase  6.6. The Maintenance Phase

6 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase l In Analysis we model the users’ requirements DO. For what the eventual system must DO. conceptual model Output of this process is a conceptual model deliverables: Consisting of 2 deliverables: n Requirements Model n Object Model

7 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase Requirements Model Now let’s look at these in detail... The Requirements model has 5 components: l Project Scope l Context Diagram l Use Case Model l Interface Descriptions l Feasibility study

8 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase Requirements Model Project Scope what our project is to produce. The Project Scope is a statement of what our project is to produce. l States in general terms what the system will do for the users. l May be a paragraph or two, l Or many pages, depending on the size of the project. l There is much variation in size and format among companies and methodologies.

9 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase Requirements Model will not do, It is also important that the Scope say what the system will not do, “push the scope” Otherwise the users will try to “push the scope” “Scope Creep.” Which causes “Scope Creep.”

1010 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase Requirements Model Context Diagram: The Context Diagram: l Shows our system as a large box, l Surrounded by smaller boxes, External Entities: Representing External Entities: outside our system ie., People, organizations, systems and other things outside our system that either provide data to it or draw data from it.

11 Context Diagram Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase Requirements Model Context Diagram Radio CHQT Advertisers Database System Advertisers Regulatory Authorities Revenue Canada Shareholders Listeners Better Business Bureau Requests Billing Statistics & Reports Program Info Credit Ratings Quarterly Reports Financial Reports

1212 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase Use Case Model Use Case A Use Case is a script, l A step-by-step description of how a user might make use of the system l To do a task. “case of the usage of the system.” It is a “case of the usage of the system.” s See Ch 7 for details.

1313 Interface Descriptions Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase Interface Descriptions l GUI l Other I.S. Systems l Real-World systems that we control l Communications interfaces l etc.

1414 Feasibility Analysis Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase Feasibility Analysis l Can we do this project? l Should l Should we? l Can we make it work? l Is the cost worth it? l etc.

1515 Feasibility Analysis Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.2. The Object-Oriented Analysis Phase Feasibility Analysis l Six Factors of Feasibility n Economic Feasibility – Costs and Benefits n Technical Feasibility – Whether technically feasible n Operational Feasibility – n Schedule Feasibility – time availability n Legal Feasibility – Legal issues n Political Feasibility – Stockholders’ issues

1616 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.1. The Life Cycle   6.2. The Object-Oriented Analysis Phase 6.3. The Object-Oriented Design Phase   6.3. The Object-Oriented Design Phase   6.4. The Construction Phase   6.5. The Object-Oriented Testing Phase  6.6. The Maintenance Phase

1717 Chapter 6: The Object-Oriented Development Life Cycle (OODLC) l Modify Analysis model to reflect design decisions, l Mostly by adding information to the existing model. l Add some new classes that do not directly model things in the real world. plan how Result is a plan of how the system will do what the Requirements Analysis asks for 6.3. The Object-Oriented Design Phase   6.3. The Object-Oriented Design Phase

1818 Analysis is what the system must do, Design is how the system will do it. Chapter 6: The Object-Oriented Development Life Cycle (OODLC)

1919   6.1. The Life Cycle   6.2. The Object-Oriented Analysis Phase   6.3. The Object-Oriented Design Phase 6.4. The Construction Phase   6.4. The Construction Phase   6.5. The Object-Oriented Testing Phase  6.6. The Maintenance Phase

2020 Chapter 6: The Object-Oriented Development Life Cycle (OODLC) l Coding and testing Should be done with an O-O language or database. l Deployment and user training.   6.4. The Construction Phase

2121 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.1. The Life Cycle   6.2. The Object-Oriented Analysis Phase   6.3. The Object-Oriented Design Phase   6.4. The Construction Phase 6.5. The Object-Oriented Testing Phase   6.5. The Object-Oriented Testing Phase  6.6. The Maintenance Phase

2 Chapter 6: The Object-Oriented Development Life Cycle (OODLC) l Complete the unit testing of individual classes and programs l Then system testing. l Testing must be thorough and complete, automated l And automated.   6.5 The Object-Oriented Testing Phase

2323 Chapter 6: The Object-Oriented Development Life Cycle (OODLC)   6.1. The Life Cycle   6.2. The Object-Oriented Analysis Phase   6.3. The Object-Oriented Design Phase   6.4. The Construction Phase   6.5. The Object-Oriented Testing Phase 6.6. The Maintenance Phase  6.6. The Maintenance Phase

2424 Chapter 6: The Object-Oriented Development Life Cycle (OODLC) l Bug fixes l Enhancements l Viruses l End-user computing l Backups and restores s 3 levels + offsite. l Disaster preparedness and recovery s The World Trade Center bombing. s Murphy’s Law  6.6. The Maintenance Phase

2525 End of Chapter 6.