Satzinger_Ch15

Satzinger_Ch15 - 15 Chapter 15 Design System Interfaces,...

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15 Chapter 15 Design System Interfaces, Controls, and Security Systems Analysis and Design in a Changing World, 5th Edition
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15 2 Learning Objectives Discuss examples of system interfaces found in information systems Define system inputs and outputs based on the requirements of the application program Design printed and on-screen reports appropriate for recipients Explain the importance of integrity controls Identify required integrity controls for inputs, outputs, data, and processing Discuss issues related to security that affect the design and operation of information systems
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15 3 Overview This chapter focuses on system interfaces, system outputs, and system controls that do not require much human interaction Many system interfaces are electronic transmissions or paper outputs to external agents System developers need to design and implement integrity and security controls to protect system and its data Outside threats from Internet and e-commerce are growing concern
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15 4 Identifying System Interfaces System interfaces are broadly defined as inputs or outputs with minimal or no human intervention Inputs from other systems (messages, EDI) I Highly automated input devices such as scanners Inputs that are from data in external databases Outputs to external databases Outputs with minimal HCI Outputs to other systems Real-time connections (both input and output) R
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15 5 Full Range of Inputs and Outputs Figure 15-1
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15 6 eXtensible Markup Language (XML) e Extension of HTML that embeds self-defined data structures in textual messages Transaction that contains data fields can be sent with XML codes to define meaning of data fields XML provides common system-to-system interface XML is simple and readable by people Web services is based on XML to send business transactions over Internet
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15 7 System-to-System Interface Based on XML Figure 15-2
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15 8 Design of System Inputs Identify devices and mechanisms used to enter input High-level review of most up-to-date methods to enter data Identify all system inputs and develop list of data content for each Provide link between design of application software and design of user and system interfaces Determine controls and security necessary for each system input
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15 9 Input Devices and Mechanisms Capture data as close to original source as possible Use electronic devices and automatic entry whenever possible Avoid human involvement as much as possible Seek information in electronic form to avoid data re- entry Validate and correct information at entry point
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15 10 Prevalent Input Devices to Avoid Human Data Entry Magnetic card strip readers Bar code readers Optical character recognition readers and scanners
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Satzinger_Ch15 - 15 Chapter 15 Design System Interfaces,...

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