Systems Analysis and Design
Older Systems
"Legacy Systems"
4 main feasibility points
- Operational ( Effective use) - Technical (Hardware, Software, Technical know how) - Economic (Cost vs Reward) - Time to Launch
Internal Factors that Affect systems projects
- Strategic planning - Top Managers - User Requests - IT Department - Existing systems and data
External Factors that Affect Systems Projects
- Technology - Suppliers - Customers - Competitors - Economy - Government
Preliminary Investigation Steps
- Understand the problem and opportunity - Define the project scope and constraints - Perform fact-finding - Study usability, cost, benefit, and schedule data - Evaluate feasibility (using the four main points) - Present results and recommendations to management
IT Department
Application Development Systems Support and Security User Support Database Administration Network Administration Web Support Quality Assurance
Data
Basic facts that are the system's raw material
BPM
Business Process Model
BPMN
Business Process Modeling Notation
B2B
Business to Business
B2C
Business to Consumer
Information System
Combines technology, people, and data to provide support for business functions.
Enterprise Applications
Company wide applications
CASE Tools
Computer-Aided Systems Engineering
Information
Data that has been transformed into output that is valuable to users.
Business Model
Describes the information a system must provide
Prototype
Early working version of an information system
EDI
Electronic Data Interchange (computer to computer data exchange)
Hardware
Everything in the physical layer of the information system
Modeling
Graphical representation of a concept or process
Information Systems 5 key components
Hardware Software Data Processes People
Business Profile
Overview of a company's mission, function, organization, products, services, customers, suppliers, competitors, constraints, and future direction.
SDLC (Systems Development Life Cycle) Phases
Phase 1: Planning Phase 2: Analysis Phase 3: Design Phase 4: Implementation Phase 5: Support and Security
Software
Programs that control the hardware and produce the desired information or results
Feasibility Study
Reviews anticipated costs and benefits
Business Process
Specific set of transactions, events, and results that can be described and documented
Systems Analysis and Design
Step-by-step process for developing high quality information systems.
System Development Methods
Structured Analysis Object-Oriented Analysis Agile Methods
Horizontal System
System adaptable for many different types of businesses
Vertical System
System design for a specific business or industry
SDLC
Systems Development Life Cycle
Processes
Tasks and business functions perform to achieve specific results
TP Systems
Transaction Processing Systems
Systems Analyst
Valued member of the IT department team who helps plan, develop, and maintain information systems
Information Technology
hardware, software, and services that people use to manage information.
System Software
manages the hardware compnents
Project Management
process of planning, scheduling, monitoring, controlling, and reporting upon the development of an information system.
Application Software
programs that support day-to-day business functions and provide users with information
System
related components that produces specific results
