ICT

ICT is the use of technology for the input of data which can be processed, stored, transferred and used to output information.

A system is a procedure that involves input, process and output.

The output information goes directly to a human being or to another computer.

Subtopic

An ICT system will include the components:

Software

Hardware

Information

People

Procedures

Data

Apps

Input

Storage

Output

Processed Data

Users

Jobs

Storage

Transferred

There are four types of data:

TEXT

Music

Recordings.

Image

Moving

Recorded Video

Still

Digital Photograph

Number

Exam Mark

Age

Price

Data is raw facts and figures that have no set values or meaning.

How Does Data Arise?

Indirect

Data that is recycled from already collected Data for a new purpose.

A Purpose that is different from the original purpose of the collection of the data.

When signing up for a subscription and entering your Email adress, and then they give or sell your Email address to another company so they can send you advertisements.

weather forecast used to predict sales - the amount of ice cream sold on a day thats sunny, by another company for example.

Direct

Data that is collected for a new specific purpose or reason.

Email address collected just for a subscription or to sign up, used just by that company.

weather measurements collected for weather forecast - wind speed, wind direction, precipitation, temperature.

Encoding

When data is converted to binary.

Binary is the 'language' of the computer.

Converted in Binary so
that the computer can understand it.

Subtopic

Coding

Shortening Data

For example: Doctor > DR.

Disadvantages

have to know the codes to understand and use it.

lose detail

Advantages

Faster - less time consuming than writing it out fully.

Data takes up less storage

More accurate - only type in certain things.

less chance making a mistake

Present = P

less GIGO

Garbage In Garbage Out

less rubbish data goes in, the less rubbish data comes out.