Please enable JavaScript.
Coggle requires JavaScript to display documents.
Information System Components - Coggle Diagram
Information System Components
A Mission-critical system is one that is
vital to a company’s operations
A System is a set of related components
that produces specific results
Information systems have five key components : hardware, software, data, processes and people
The Development Tools and Techniques
Systems analysts work with these tools in
a team environment
Modelling
A systems analyst can describe and simplify an information system by using a set of business, data, object, and process models.
2. Prototyping
- Early working version of an information system
- Speeds up the development process significantly
- Can be an extremely valuable tool
3. Computer-Aided Systems Engineering
(CASE) Tools
- CASE uses powerful software to help systems
analysts develop and maintain information systems
Systems analysts must know how to use a variety of techniques such as modeling, prototyping, and computer-aided systems engineering tools to plan, design, and implement information system
Hardware
*- Everything in the physical layer of the information
system*
-
Moore’s Law accurately predicted that computer processing power would double every 18 to 24 months
Software
Legacy systems
- outdated computing software and/or hardware that is still in use
Vertical system
- software that is defined and built according to a user's specific requirements in order to achieve specific functions and processes that are unique to that user
ex: web-based retailer, a medical practice, or a video chain.
System software
- a type of computer program that is designed to run a computer's hardware and application programs.
- the system software is the interface between the hardware and user applications.*
Horizontal system
- any software application that is designed to be used by many different types of users and businesses.
- a type of generic application that has usability and utility within a broad range of users.
- also be called a general-purpose application.
Network operating system
-
an operating system that manages network resources
an operating system that includes special functions for connecting computers and devices into a local area network (LAN)
Enterprise applications
- a large software system platform designed to operate in a corporate environment such as business or government
Application software
- a computer program designed to help people perform an activity.
Data
- The raw material that an information system transforms into useful information
Processes
- Describe the tasks and business functions that users, managers, and IT staff members perform to achieve specific results
People
- Users, or end users, are the people who interact with an information system, both inside and outside the company
System Development Methods
1. Structured Analysis
- traditional systems development technique
- Uses the systems development life cycle to plan, analyze,
design, implement, and support an information system
2. Object-oriented (O-O) analysis
- combines data and the processes that act on the data into things called objects
**- Systems analysts use O-O to model real-world business processes and operations
3. Joint Application Development and Rapid Application Development
- JAD – Team based fact finding :
- RAD – compressed version of the entire process
4. Other development methodologies
- In addition to structured analysis and O-O
methodologies, you might encounter other systems development techniques
- Microsoft Solutions Framework (MSF) documents the experience of its own IT teams