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ICT Unit 1: Topic 1
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Mind Map on ICT Unit 1: Topic 1, created by themisfits on 04/16/2013.
Mind Map by
themisfits
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Resource summary
ICT Unit 1: Topic 1
Data and Quality of Data
Data, Information and Knowledge
Data- Raw facts and figures with no meaning. Data can be numbers, text, images or sound
Information- Data that has been processed by the computer.
Data+Meaning+Context=Information
Knowledge- Information that has had rules applied to it
GIGO
Stands for Garbage in Garbage Out
It means if you input rubbish data into the computer then you will get rubbish data out
Processing
Performing calculations or arranging the data into a meaningful order
Transaction
A piece of buisness
E.g. an order, purchase, or transfer of money
Encoding and Storing Data
Encoding
Assigning codes to the data to reduce it's size
E.g. S=Small, M=Medium, L=Large
E.g. LHR= London Heathrow, MAN= Manchester
Advantages
Takes up less storage space
Easily Transferable
Easier to back-up
Disadvantages
Easily stolen
Training is needed
Security problems
Data Validation
Errors that can be made
Transcription Error
Error made when typing in data using a document as the source of data
e.g. mishearing what a person says over the phone and entering it into the computer
Transposition Error
Error made when characters are swapped around so they are in the wronng order
e.g. writing tumlbr instead of tumblr
Validation Checks
Check Digit
A decimal number or alphanumeric character added to a number for the purpose of detecting the sorts of error humans normally make on data entry
e.g. Account numbers will have check digits to check that the numbers entered are correct
Range Check
checks that data inputted is within a certain range
e.g. when signing up for facebook you have to be 13 or older,so anyone with the birth year below 2000 would not be allowed to sign up
Presence Check
used to check that the correct data is entered into the correct fields
e.g. entering a username and password
Verification Checks are used to restrict the data that a user can enter to reduce errors
Data Verification
Pairty Check
used to make sure that the data sent is the same as the data that is received when data is transmitted from one computer to another
e.g sending an email from one person to another
Data verification checks that the data being entered into the system perfectly matches the source of data
e.g. checking text/data in an email and making sure when the other user receives it there are no errors
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