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AS ICT May 29




2012
Unit One
Revision
Notes
Unit 1.1 ­ Unit 1.5.




Unit 1.1

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Data and Information:

Data ­ This is raw facts and figures that have no meaning, it needs to be
processed into a more meaningful form. It cannot be understood without a
context. E.g. `red light' means nothing without a setting.

Information ­ This is data that has been processed into…

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In a supermarket the barcode is scanned so that the price can be read and then
a bill is drawn up for the customer.

Advantages of direct data:

1: The information collected will be relevant. The information collected is
exactly what the organisation wants and will not require additional processing…

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Five main factors affecting the quality of information:

Presented effectively: the information should be presented to the user by the
system in an appropriate format.

Accurate: information should be error free in order to prevent poor decisions
to be made and a loss of confidence in the source of the…

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Substitution errors

Occurs when information appears to be complete, but it is incorrect.

E.g. Name: Keitj (wrong) instead of Keith (correct)

Transposition errors

The correct information is entered but it is slightly reversed or mixed up
in some way.

E.g. Name: Kieth (wrong) instead of Keith (correct)

Transmission errors

Caused…

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limits are deemed valid. If it doesn't fall between these boundaries it is not
accepted and an error message is displayed.

Batch total: batch total are applied to groups of data and used to make sure
that the data is correct by checking the original batch total against a
recalculated…

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Hardware

Software

Personnel



Hardware Overheads

Computers and peripherals including:

OMR, OCR

Storage media, including online storage and data backups

Printers and associates running costs such as paper and toner.

Network hardware such as a server will be required to store and process
data.

Cost of bills if installing a WAN…

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Standardising Bodies

PTT

· Postal, Telegraph & Telephone

· Name given to mail regulators (traditional & electronic)

· i.e. BT & Royal mail (used to be GPO)

· Today Ofcom is the govt body who oversees telecommunications standards in
broadcasting



ITU

· The International Telecommunications Union

· standardises and regulates…

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· Made up of national standards bodies

· Not a Govt organisation but ISO standards are more likely to become law

· Remit covers a wide range of areas:

­ Defining units of time and measurement to

­ Setting standards for CD formats



ANSI

· American National Standards Institute

·…

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ACM

· Association for Computing Machinery

· American equivalent of BCS

· delivers resources that advance computing as a science and a profession

· Provide a Digital Library of computer science literature, publications, online
books, courses



Input & Output Devices

Keyboards

· Have Keys which when pressed send digital code…

Comments

Charlotte Buick

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Do you have any revision notes for ccea a2 ict? these ones are great!!!

conor

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Do you have any a2 notes? Would be greatly appreciated!

Lisa

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Thank you so much- these notes were amazingly helpful to me! I wish you had A2 as well :P

darragh

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do you have a2 notes?:)

bodie8p

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Hey Stephen I am CCEA A2 ICT student i found your AS notes extremely helpful and was wondering would you have any A2 notes, if so could you send them to be it would be appreciated very much

Thanks

john98

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any word on a2 notes?

peter5858

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Any A2 notes floating about gis a shout just, goodmen in advance

james286

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If you're looking for a2 notes go to "notes sale" but the only bad thing is that they will cost you £4.00

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