itft-Detail design
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Transcript of itft-Detail design
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Detailed Design
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Introduction
• The design translates the system requirements into ways of operate them.
• The design is a solution, a “ how to “ approach, compared to analysis, a “what is” orientation.
• The design phase focuses on the detailed implementation of the system recommended in the feasibility study.
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Modularization
• One way to plan a new system is to focus on each functional subsystem as a separate entity or application area.
• Using such an approach, each application area is treated as if it were totally independent.
• The modular systems approach divides each application area into a number of smaller units called modules.
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Advantages Of Modularization• speed up the systems process.
• eliminates unnecessary duplication.
• result in higher quality.
• provides better control over the total system project.
• allows flexibility as additional features may be added later.
• parts of the system can be tested separately.
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limitations Of Modularization
• Modular systems design is best viewed as one aspect of a broader planning issue, but it is not a required step in the design process.
• changes and errors affect common modules, the negative consequences can be widespread
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Input Design
• Inaccurate input data are the most common cause of error in data processing.
• Errors entered by operator can be controlled by input design.
• Input design is the process of converting user-originated inputs to a computer based format.
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Goal of input design
• The goal of designing input data is to make data entry:-
• Easy
• Logical
• Error free.
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Input media and devices
• Keyboard
• Mouse
• Touch Screen
• Sound and speech
• Automatic data capture• Optical mark recognition (OMR)
• Bar codes
• Optical character recognition (OCR)
• Magnetic Ink
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Data input methods
• ON-LINE - User directly Enters data using screen prompts.
• OFF-LINE -Forms filled by users- for example-candidates for admission to a college fill forms
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DATA OUTPUT DESIGN
• Outputs present information to system users.
• Outputs, the most visible component of aworking information system, are thejustification for the system.
• During systems analysis, you defined outputneeds and requirements, but you didn'tdesign those outputs.
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Output-design Objectives
• Serve the intended purpose
• Deliver the right quantity of output
• Deliver it to the right place
• Provide output on time
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Outputs Reports
• Detailed Reports: • Present information with little or no filtering or
restrictions. • Some detailed reports are historical in nature.
• Exception Reports: • Filter data before it is presented to the manager
as information.• Exception reports only report exceptions to some
condition or standard.
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Types of Outputs
• Internal outputs
It stay inside the system to support the system's users and managers
• External outputs
It leave the system to trigger actions on the part of their recipients or confirm actions to their recipients
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Output Media
• Paper
• Screen
• Microfilm
• Video/Audio
• CDROM, DVD
• Other electronic media
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Output Formats
• Tabular output
• Zoned output
• Graphic output
• Narrative output