Transaction Processing Systems: The Need for Systems Design Methodology Teaching Paul Rosenthal California State University, Los Angeles

Outline Importance of TPS Applications Scope of TPS Applications Recommended Physical Design Charting Approach Typical Physical Design Methodologies Oversimplification of Design Examples

Transaction Processing Systems Transaction Processing Systems applications (TPS) are the core of information systems (IS) impact on the public. In the typical business organization, because of the number of clerical workers normally involved, they constitute the majority of IS project funding requirements.

A Typical Text’s View Turban, McLean & Wetherbe (2004). IT for Management.

The True Scope of Transaction Processing Systems

The Need for Integrated Design Methodology Teaching

The Need for Physical Design Methodology Teaching For TPS, a physical design is created from a DFD based logical design, by separating processes and data stores by: time (daily vs. monthly, day vs. night...), place (client or server), centralized vs. distributed..., online vs. batch, manual vs. automated, etc.

A Term Project Architecture

Typical Physical Design Methodologies Whitten (2004) - Their physical data flow diagram based method for an online system demonstrates: person/machine boundaries network architecture technology assignment process distribution data distribution

Typical Physical Design Methodologies Pressman (2004) – diagrams a process view of the transition to design

Oversimplification of Design Examples

Partial Function Design

More Complete Online Scope

Oversimplification of Scope Shelly, Cashman & Rosenblatt (2006)

More Complete System Scope

Standard USE Case Charting Method

Replace Incorrect Symbols