Chapter 4.docx

4 Pages

Information Technology Management
Course Code
ITM 350
Franklyn Prescod

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Chapter 4 – Enterprise-Wide and Inter-Enterprise Systems Introduction  Enterprise-wide systems are any information systems that are deployed throughout an enterprise with the intention of enabling a consistent type of functionality as well as enterprise-wide access to the same data o Intended to make information available to all personnel in the enterprise who need it regardless of where the people are located  Middleware is a general term for any software or programming that serves to link together or communicate between 2 separate & different programs o Often used to allow an ERP system to pass data back & forth between it  Legacy system is an old outdated application that has not yet been replaced or upgraded ERP Systems  ERP systems have all the characteristics of enterprise-wide systems o Allow free flow of information in organizations  Refer to figure 4.1 (Traditional Data Structure)  Refer to figure 4.2 (Centralized Data Structure)  Y2K is a term referring to the year 2000 & was a common abbrev. to categorize the computer glitches that were widely predicted to take place when the calendar turned to the year 2000  Business process reengineering (BPR) is a fundamental rethinking and radical redesign of existing business processes to add value or prepare for new technologies  ERP systems works across an entire organizations and it has different modules under it o Financial accounting modules o Sales and distribution modules o Materials management modules o Human resources modules Characteristics of ERP Systems  Client-Server Systems o Client-server system is a network configuration that evolved from networks built around central computers (servers) to provide computing power to the users on their own desktop computers (clients) o Relational database system is a logical database model that relates data in different tables within the database by sharing a common data element between them o 3 basic elements to any IS  Data  Processing  Output o Refer to figure 4.3 (3-Tier Client-Server System) o Relational Databases  All ERP systems use a relational database for acting as the central vehicle for gathering and holding data for the enterprise  Relational database systems enable the storage of vast amounts of information that can be easily accessed by the user through the use of user-friendly interfaces or data-retrieval languages  Common database used for ERP systems is Oracle o Packaged Software  Known as COTS (commercial off-the-shelf) software is written by software development companies  Usually bought off the shelf, installed and operated  ERP systems are a form of packaged software  It needs to be customized as much as possible to the specific company using it o Business Process Reengineering (BPR) 
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