What is encoding?
Encoding involves shortening data when inputting it into a computer system
List 4 benefits of encoding data
- it saves time because entering encoded data is quicker
- there are fewer characters so less storage space is needed
- less storage space means that it’s faster to access coded data
- there is less chance of human typographical errors
Give some examples of encoded data
- Sex- M (male) F (female)
- teacher initials on school timetables
- airline codes on airport departure boards
Give some advantages of storing data using ICT
- it can be cheaper as less money is spent on filing cabinets for example
- it is easier and quicker to transfer or back up data elsewhere using the internet
Give some disadvantages of storing data using ICT
- training will be needed to show staff how to use computers. This can be expensive
- the ease of transferring data is a security risk. Protection from hackers is needed
What are validation checks?
Validation checks are used to make sure that only sensible data is entered into a computer.
What is a batch total?
Checks that something is not missing by adding together a number field in different records and checking the total
What is a hash total?
Exactly the same as a batch total but the field checked is meaningless
Transcription errors…
sometimes occur when copying data to a computer (when reading bad handwriting, for example)
Transposition errors…
sometimes happen when characters are accidentally swapped around
Verification checks…
can be used as techniques to overcome these possible sources of error. Verification just means stopping errors when data is copied from one medium to another.
Name 3 types of verification checks
- double keying
- visual check
- parity check
What is double keying?
Data is entered twice to check that both sets of data match up
What is a visual check?
Also known as proofreading (double-checking something)
What is a parity check?
Checks that data is correct when it is transmitted (sent) somewhere
