HRM 3450 Lecture Notes - Lecture 18: System Model
5 May 2018
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HRM 3450 Tutorial 18 Notes – It system architectures
Introduction
• The same approach might be taken with a computer system, with a central processor
module, a graphics display module, an audio module, a network module, a hard drive
controller module, and so on.
• For example, shows the basic system hardware components that make up an iPhone.
• It is also important to realize that there may be many different representations for a
system, to reflect the various uses of the system model.
• Returning to our IT roots for an example, the representation of the business system
shown is a traditional hierarchical organization chart.
• The components are departments that perform various functions within the business.
• In contrast, a partial model of the same business shown represents the application
architecture of an IT system within this business.
• Take another look at for still another representation of a business.
• As another simple example, you could represent a house by the physical appearance of
its exterior, by the function and layout of its rooms, or by the various subsystems,
electrical, plumbing, heating, and so on that the house requires.
• Presumably, each of these representations would be useful to a different participant.
• In fact, we would expect an architect to provide all of these for use by the owner, the
builder, and the various contractors.
• The use of system concepts is particularly applicable when discussing the various types
of IT systems.
• In general, the goal of IT systems is to assist organizations to meet the strategic needs of
the enterprise.
• Not surprisingly, IT systems are frequently complex, and the ability to separate them
naturally into subsystems or components of manageable size simplifies understanding
of the system as a whole.
• The basic system hardware components that make up an iPhone.
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