Ch 11 Flashcards
What are the 3 approaches to acquistion of IT based information systems?
- Custom design and development, 2. system selection and acquisition, 3. End-user development
What are the advantages of custom development?
- unique tailoring, 2. Flexibility and control
What are the advantages of purchasing software?
- Faster Roll-Out 2. Knowledge infusion- uses best practices from industry and code into application 3. Economically Attractive 4. High Quality (Tested)
What are the two system deveoplemt life cycles?
SDLC (system development life cycle) and Prototyping
Explain the SDLC approach
based on the notion that detailed justification and planning is the vehicle to reduce risk and uncertanity in the system design and development efforts
Why is SDLC called the waterfall model
Because as water flowing down a waterfall never flows upward, there should be NO going back once a stage has been completed
What are the 3 principle phases of SDLC
Definition, Build and Implementation DBI
What is Definition of SDLC?
clearly indentifying the features of the proposed information system
What are the 3 components of Definition of SDLC
Investigation, feasibility and system analysis
What are the 3 components of Build of SDLC
System design, programming and testing
What are the 3 components of implementation of SDLC
installation, operation and maintenance
What are the 4 approaches to installation of SDLC
Parallel, direct, phased and pilot
What is parallel
running old and new systems at the same time
What is direct
direct disconnect of the old system and switch to new system
what is phased
progressive change over to the new system
