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
