The document discusses logical and physical design in systems development. It explains that logical design defines the functions and components of a system, while physical design plans the actual implementation based on logical design. IPO/HIPO charts were developed by IBM to hierarchically describe a system's structure, functions, inputs, processes, and outputs through diagrams. The purpose is to define procedures and operations in a systematic manner by relating inputs, processes, and outputs.

1. Department of Computer Science & Engineering
(July – Dec 2020)
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2. Logical,
Physical design
And IPO/HIPO
charts
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3. Introduction
• Starts with the planning of a new system
• Designing is not a single phase of SDLC
• Design is always happening
• You collect info, then Design, collect more info
from feedback and Design again.
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4. Relationship between logical
and Physical Design
– The logical design defines the functions and
features of the system and the relationships
among its components
– Logical design done during the system analysis
phase
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5. The Relationship between Logical and
Physical Design
– The physical design of an information system is a plan for the
actual implementation of the system
– The physical design is built on the system’s logical design and
describes a specific implementation
– System design usually begins after completing system analysis
phase
– Some overlap is possible, you might return to fact-finding if you
discover that you overlooked an important issue, if user have
significant new needs, or if legal or governmental requirements
change
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6. • The systems analyst must understand the logical design of the
system before beginning the physical design of any one
component
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7. IPO/ HIPO Charts
• Developed by IBM
• To understand structure and
functions of systems
• To provide easily understandable
description of various parts of
system
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8. Purpose:
• to define procedures and operations in a
hierarchical manner, correlating input,
processing, and output steps with the
integrated whole expressed in the
hierarchy diagram.
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9. HIPO
• A HIPO package consists of a hierarchy chart and IPO
overview diagram and IPO detail diagram:
– Hierarchy Chart
– IPO Chart
– IPO detailed chart
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10. HIPO Diagram
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11. IPO overview diagram
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12. IPO Detailed Diagram
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13. Dilbert’s Boss: Lazy system
Analyst
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