DataData

Information and dataInformation and data

• Data consist of values stored inside the computer

It does not mean muchmost of the time it is stored as coded data

Information added valueis meaningful to us

Something that can make us do certain action.

Data collection and preparationData collection and preparation• Data is the main component when

speaking about processing• Without data no output!!!!!!!!!• Data that we input has to be

collected• Not always that data is also in a form

that we can use!• Data has to be prepared!

• Analogue data data that can take any value such as temperature, lenght, weight.

• Digital data computers like digital data it is data that cabe accepted by computer compouter might only accept values up to two decimals and similar.

• Analogue data has to be converted into digital data prior using it at the computer.

Data input and checkingData input and checking• When we input data we have to

make sure that no errors have been made.

• For that purposes we have two types of checking that should be done on data input to a system:

• Data verification• Data validation

• Data verificationchecking to make sure that taht what was input to the system was meant to be inputed.

• i.e. Typing errors and similar.you should always double check or

have two people check what has been keyed.how it is checked depends on the importance of data

• Data validation making sure that the right sort of data has been input.

• Computer does this by following set of rules.

• It depends from your needs and software used

File organisation and File organisation and techniquestechniques

• File full set of data• File is to large and sometimes to

comlex to find certain data• So it is split into smaller portions

calledrecords• Record consist out of few smaller

parts stored in a space and is called field

• Each record is uniqely identified key field