Chap01-SysDev - OOSADChapter1 TheSystemsDevelopment...

Info iconThis preview shows pages 1–17. Sign up to view the full content.

View Full Document Right Arrow Icon
1 OOSAD Chapter 1 The Systems Development  Environment
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Learning Objectives Define information systems analysis and design Explain basic concepts of systems  Describe the information Systems Development  Life Cycle (SDLC) Describe TPS vs. MIS vs. DSS systems Describe the role of the systems analyst Discuss systems analysis skills Recount the evolution of systems development  methodologies
Background image of page 2
3 What is a System? A system is a group of  interrelated procedures  used for a  business function , with  an identifiable boundary , working  together  for some purpose . A set of processes that are linked together by rules to form  a unified process. A system has boundaries but interacts  (exchanges data) beyond those boundaries. Examples: Payroll systems, Order Entry systems, E-store  systems, Gaming systems
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 What is Information Systems Analysis and Design The process of implementing and operating a  computer-based information system. Requires knowledge of: Organization’s objectives, structure, processes Information technology capabilities Major goal: to improve organizational systems by  developing or acquiring software and training  employees in its (proper) use
Background image of page 4
5 Information Systems Analysis and Design Computer-based information systems are complex  with many components: Infrastructure Application People
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 Fig 1.2 Components of a system
Background image of page 6
7 Software Engineering Process
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 Software Engineering Process Methodologies Techniques Tools
Background image of page 8
9 Important System Concepts What is a  system ? an  inter-related  set of  components , within a  defined  boundary , working together for some  purpose does not necessarily imply a computer! anything can be thought of as a system!
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Components Input Output Interface Interrelationship Environment Figure 1-4 Boundary Constraints? Purpose?
Background image of page 10
11 Important System Concepts component   inter-relationship boundary   purpose   environment
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
12 Important System Concepts interface   input   output   constraint
Background image of page 12
13 Important System Concepts Measuring system boundaries and interfaces:  OPEN SYSTEM CLOSED SYSTEM EXAMPLE?
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
14 Important System Concepts DECOMPOSITION Break something (a system) into  smaller   constituents (components, subsystems, modules,  parts) Why?
Background image of page 14
15 Important System Concepts MODULARITY Result  of Decomposition Try to ensure modules / components / parts are  relatively uniform size and complexity Often need a scheme to identify and organize 
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Important System Concepts COUPLING - How much do components depend on  each other? Examples?
Background image of page 16
Image of page 17
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 57

Chap01-SysDev - OOSADChapter1 TheSystemsDevelopment...

This preview shows document pages 1 - 17. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online