面向对象的系统分析与设计第一章PPT课件

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Core Concepts
Major goal of systems analysis – improve organizational systems
Development/acquisition of application software
methodologies.
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What Is Systems Analysis and Design?
The process of developing and maintaining an information system
Main goal – improve organizational systems via software to help accomplish business tasks efficiently and easily
Interfaces – points of contact between system and environment
Inputs – data from environment to system
Output – data from system to environment
Constraints – limit to what the system can accomplish
Other elements of IS – hardware, system software, documentation, training materials, job roles, controls and security, people
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Interrelationships – associations and dependencies between components of a system
Boundary – divides system from environment
ຫໍສະໝຸດ Baidu Purpose – goal or function of a system
Requires knowledge of:
– Organization’s objectives, structure, processes – How to exploit information technology for advantage
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Important System Concepts
Decomposition – breaking down a system into smaller constituents
Modularity – the result of decomposition; parts of a system
Coupling – extent of dependencies between subsystems
Cohesion – extent to which a subsystem performs a single function
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整体概述
概况一
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概况二
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概况三
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Chapter Objectives
After studying this chapter you should be able to:
– Define information systems analysis and design. – Explain the basics about systems. – Describe the information systems development cycle
(SDC). – Describe TPS, MIS, and DSS. – Describe the role of systems analyst. – Recount the evolution of system development
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Transaction Processing System (TPS)
Automate the handling of data for business activities or transactions
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What Is a System?
A group of interrelated procedures used for a business function, with an identifiable boundary, working together for some purpose.
Chapter 1: The Object-Oriented Systems
Development Environment
Object-Oriented Systems Analysis and Design
Joey F. George, Dinesh Batra, Joseph S. Valacich, Jeffrey A. Hoffer
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Characteristics of Systems
Components – irreducable or aggregate parts of a system (also called subsystems)