《信息技术战略管理》Chapter 12 Svstems Development

Chapter 12 Systems Development The Strategic Management of Information echnology

Chapter 12 Systems Development The Strategic Management of Information Technology

Transaction Processing System Input Process Output Systems Development Communication Information

Transaction Processing System Input Process Output Information Communication Systems Development

Systems Development Life Cycle Consists Of Six Phases Systems Planning Systems Analysis General Systems Design Systems Evaluation and Selection Detailed Systems Design Systems Implementation

Systems Development Life Cycle Consists Of Six Phases Systems Planning Systems Analysis General Systems Design Systems Evaluation and Selection Detailed Systems Design Systems Implementation

3 Categories of Systems Design Global-Based Systems Group -Based Systems Local-Based Systems

3 Categories of Systems Design Global-Based Systems Group-Based Systems Local-Based Systems

Global-Based Systems arge, Complex Information Systems that Process High Transaction∨ olumes Complete Overhaul or Replacement of Systems Design Components Old output is changed from monthly tabular reports to online screen displays New processes are developed Input captured by scanning devices Old hierarchical database is converted to new relational database with standard query language Controls are installed New technology platform composed of enterprise-wide network topology supports systems design components

Global-Based Systems Large, Complex Information Systems that Process High Transaction Volumes Complete Overhaul or Replacement of Systems Design Components – Old output is changed from monthly tabular reports to online screen displays – New processes are developed – Input captured by scanning devices – Old hierarchical database is converted to new relational database with standard query language – Controls are installed – New technology platform composed of enterprise-wide network topology supports systems design components

Group-Based Systems Serve a Single Department or other specific group of users smaller than, connected to global-based system

Group-Based Systems Serve a Single Department or other specific group of users – smaller than, connected to global-based system

Local-Based Systems Concentration on Local environment

Local-Based Systems Concentration on Local Environment

Rapid application Development Joint Application Development ( JAD) pecialists with Advanced TOOlS(SWAT) Computer-Aided Systems and Software Engineering (CASE Tools Prototyping

Rapid Application Development Joint Application Development (JAD) Specialists with Advanced Tools (SWAT) Computer-Aided Systems and Software Engineering (CASE Tools) Prototyping

Design Approaches Process-Oriented Approach Data-Oriented Approach Object-Oriented Approach

Design Approaches Process-Oriented Approach Data-Oriented Approach Object-Oriented Approach

Design Principles Modularity Maintainability Reusability Libraries of object class catalogs Reliability Extendibility Standardized Independence Variety in Use Top-Down Design Start with Abstract Description of New System Refine View in Successive Steps Bottom-Up Design Start with Objects and Assemble them to completed product

Design Principles Modularity – Maintainability – Reusability Libraries of object class catalogs – Reliability – Extendibility – Standardized – Independence – Variety in Use – Top-Down Design Start with Abstract Description of New System Refine View in Successive Steps – Bottom-Up Design Start with Objects and Assemble them to completed product