A simple presentation on data, data collection, data input, verification and validation.

1. DataData

2. Information and dataInformation and data
• Data  consist of values stored
inside the computer
It does not mean muchmost of the
time it is stored as coded data
Information  added valueis
meaningful to us
Something that can make us do
certain action.

3. 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!

4. • 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.

5. 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

6. • Data verificationchecking 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

7. • 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

8. File organisation andFile 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
calledrecords
• Record consist out of few smaller
parts stored in a space and is called
field
• Each record is uniqely identified 
key field