F451 stuff

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  • Created on: 21-04-11 16:48
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F451: Computer Fundamentals
3.1.1 Components of a Computer System
a. define the terms hardware, software, input device, storage device and output device
Hardware is the physical parts of the computer system.
Software is the set of instructions that tell the computer to do something.
An output device any piece of hardware which receives data from the computer.
An input device is any piece of hardware which sends data to the computer.
A storage device is any piece of hardware which stores data.
Systems software: this is a set of instructions that make the hardware of the computer
available to use, it allows the human beings to communicate with the computer. These
soft wares are programs that control the movement of data around the computer,
programs that turn instructions in human understandable form into instructions that a
computer can recognise.
Applications Packages: a piece of applications software is a program, or a set of
instructions that is designed to make the computer carry out some task. It differs from
system software in that it makes the computer do something useful for the user.
b. describe the purpose of input devices, storage devices and output devices
Input devices are needed to allow easy inputting of data into a computer:
Magnetic stripe reader
Output devices are needed to allow the computer to show the results of its calculations:

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Storage devices are needed to allow the computer to store:
The operating system
User data / files
Hard disc
Tape drive
CDR drive
c. describe the different roles and functions of systems software and applications
Systems Software: This is also known as the operating system, it controls the
basic functions of a computer and it controls the hardware of the computer, it
allows the user to communicate with the computer and it lets the software and the
hardware communicate with each other.…read more

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Output screens
Data capture methods
Data structures
Implementation plan
Test plan
Development: This is when the actual system is created, and it involves writing the
code/algorithms, modifying the existing software and also producing or purchasing and
hardware that are needed for the system.
Testing: The system is tested against the user requirements.
Implementation: The new system is put into action:
Direct implementation: This is when you simply stop using the old system and
immediately use the new system.…read more

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Not be able to deal with expansion
Be outdated
Not be user friendly
Not be safe
Not be financially suitable
Not be legal
Normally a person, a company or an organisation decides a task would benefit from
computerisation. The owner of the problem probably understands the problem well, but
doesn't understand the consequences of using computers to try to solve the problem,
or, whether such a solution is even possible.…read more

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It is crucial to a project that as much information is collected as possible about the
system to be replaced. Without this information, it is impossible to analyse the problem
properly.…read more

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Decisions need to be made about the relative importance of the different ways of
accessing the data.…read more

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Inputs what data will need to be input, the way in which the data will be
inputted, what data is requires, what is that data's format
Outputs what output is required from the system, in what format it will be
outputted so that it is suitable for its application, and also how it will be
1. Information can be arranged on a monitor screen by always putting
the same sort of information in the same place.…read more

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User Interface ­ what sort of user interface the system will use, and what
features it will have and how it will be adapted for the needs of the system
Test Plan a plan for testing the system should be carried out. This needs
to consider the details of the purpose of each test and the test data that
will be used.
The design specification focuses on high level design (e.g.…read more

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Use the requirement spec to test whether each point has been met
· Is the system secure?
· Is it easy to maintain?
· Is it user friendly?
o ...for the skill level of the users?
· Is it compatible with existing hardware and software?
· Is the support sufficient
o Is the manual easy to follow?
o Is the online help adequate?
· Is the technical support satisfactory
h.…read more

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The user documentation is aimed at the user and it contains:
o Overview of package
o Index
o Installation
o Backing up
o Printing
o Instructions for use
With screenshots showing inputs and outputs
o Troubleshooting
o Contacts for further support
The user documentation may help with things like how to install the system onto specific
hardware, the methods of input of data, the examples of valid input, and examples of
output, and examples of valid input and examples of output screens and it may…read more


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