• 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”
• The design phase focuses on the detailed
implementation of the system recommended
in the feasibility study.
• 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.
• speed up the systems process.
• eliminates unnecessary duplication.
• result in higher quality.
• provides better control over the total system
• allows flexibility as additional features may be
• parts of the system can be tested separately.
• 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
• 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.
Goal of input design
• The goal of designing input data is to make
• Error free.
Input media and devices
• Touch Screen
• Sound and speech
• Automatic data capture
• Optical mark recognition (OMR)
• Bar codes
• Optical character recognition (OCR)
• Magnetic Ink
Data input methods
• ON-LINE - User directly Enters data using
• OFF-LINE -Forms filled by users- for example-
candidates for admission to a college fill forms
DATA OUTPUT DESIGN
• Outputs present information to system users.
• Outputs, the most visible component of a
working information system, are the
justification for the system.
• During systems analysis, you defined output
needs and requirements, but you didn't
design those outputs.
• Serve the intended purpose
• Deliver the right quantity of output
• Deliver it to the right place
• Provide output on time
• Detailed Reports:
• Present information with little or no filtering or
• Some detailed reports are historical in nature.
• Exception Reports:
• Filter data before it is presented to the manager
• Exception reports only report exceptions to some
condition or standard.
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
• CDROM, DVD
• Other electronic media