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Input ­ incoming data that computers read
Process ­ the operation that turns data into
Output ­ displayed or printed information,
or perhaps sound…read more

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Data, Information & knowledge
­ the stream of recorded facts, events or transactions
­ may be encoded
­ data that has been processed into a useful form
­ Is concerned with how to do things, with causes and
­ In ICT terms it is concerned with the application of rules
to information…read more

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Knowledge Workers
­ Generally people in professions
­ Specialised knowledge makes them `experts'
­ They create new products, or provide services, or make
· Based on formal and informal rules that they have learned
through training and experience
Knowledge-based systems (Expert Systems)
­ Many rules are based on probabilities
­ Computers can be programmed with subject `knowledge'
· In the form of facts, rules and probabilities
­ These `expert systems' or `knowledge-based systems'
can be used to deliver advice to a user
­…read more

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Using a knowledge base
There are many on-line knowledge bases
A user will typically be asked to supply answers to a
series of questions
The program will then respond:
­ Either with a course of action
­ Or with a reduced set of possible answers
Such systems exist for:
­ Software help
­ Medical help
­ Selection of mortgage type and repayment amounts
­ Etcetera…read more

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Sources of data
Data can be collected from many sources,
­ directly - collected for a specific purpose
· For example, library or payroll
­ Indirectly - derived from data originally collected
for an entirely different purpose
· Information collected from credit card use
· Shopping patterns
· Used to target marketing campaigns…read more

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Encoding information as data
Encoded data may often only be meaningful when
put into context by some process
­ For example a string of numbers may represent payroll
· Paynumber, date, start time, finish time, quantity picked
· Unless you know where one field starts and the other finishes
the data would be meaningless
Encoding information as data may also cause loss
of precision, for example:
eye colour
on a scale of 1 to 10…read more

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Quality of data
To be useful, data must be:
­ Accurate
­ Up-to-date
­ Complete
How many web-sites can you be sure of in
this respect?…read more


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