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IT AS Notes
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IT AS Notes
Chapter 1 - Data, Information, knowledge and processing
Data, Information and knowledge
Data ­ raw facts and figures before they have been processed.
Information ­ Data + [structure] + [context] + Meaning
Structure ­ how the data is presented? Are the numbers actually numbers or should they be
read as text?
Context ­ an environment where out prior knowledge an understanding can make sense of the
data.
Meaning ­ data in the correct structure and placed within the context.…read more

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IT AS Notes
Graphics Multilingual ­ do not Can be confusing if you do not
need language to know the symbols ­ does everyone
understand an image. know the road signs?
E.g. male or female Some symbols do not mean the
Can match what you
same thing in different countries
see ­ physical signs
Sound No fixed position No good in large areas ­ distortion
No line of sight of sound
required Usually language based
Good for visually May not know the sound ­ e.g.…read more

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IT AS Notes
12.00
Used to hold numbers where precision is important:
Measurements in a house / building ­ 2.7m wide
Prices of goods - £1.75
Height of people ­ 1.82m
Integer ­ contains whole numbers with no decimal places.
45
125
1250
Used where accuracy may not be vital importance or the value allocated is specifically
a whole number:
TV Channels
Large amounts of money
Text / string ­ alphanumeric character. Includes numbers, text and symbols.…read more

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Direct (primary) ­ collected form an original source. Often easiest to think of it as data that has
been physically collected by you.
Indirect (secondary) ­ has two interpretations:
Data that has been used for a purpose different to that for which it was collected. For
example, collecting data on how many tickets have been sold for a particular film, and
then using that data to find the most popular film.…read more

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IT AS Notes
Requires a computer with CD-ROM drive Doesn't need computer ­ can access from
any device with internet access ­ mobile /
tablet
Data can't be updated very quickly Data can be updated quickly
Can be scratched / broken or lost / stolen Internet access can be down.…read more

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IT AS Notes
Taking the original data and storing it in a different a different representation. E.g. shorthand or
putting it into code.…read more

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IT AS Notes
Check digit ­ used to calculate and verify the barcode. The check digit is the last digit.
Verification
If you have collected some information on paper, at some point it will need to be entered into a
computer.
Paper-based copy is known as the source document.
The copy on the computer is known as the object document.
Verification is making sure that the information on the source document is the same as the
information as the object document.…read more

Comments

margaret Reeves

Looks brilliant thanks

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