ICT

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Four different data types.
Text, still and moving images, sound, numbers
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What is a mechanical mouse?
A mouse with a rolling ball on the bottom and the computer senses it's position on a flat surface, typically used on a mouse mat.
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What is an optical mouse?
A mouse with a light sensor used to detect motion and it doesn't need to be used on a mouse mat.
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What is OMR?
Optical Mark Recognition and it uses a light beam to sense the position of a mark on a piece of paper, the software allocates a value to the mark depending on where it is on the paper.
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What is OCR?
Optical Character Recognition and when a page is scanned it compares the image to a dictionary of known letter shapes, the letters are then converted into computer characters.
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What is RFID?
Radio Frequency Identification and it uses radio waves to transmit a unique serial number as a form if ID for objects, a tag is attached to an object and the tag transmits the serial number to a reader which sends the data to a computer.
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Flat bed scanner
Has a flat glass plate to which the document is placed.
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Bar code scanner
Form of flat bed scanner used in supermarkets.
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Hand-held scanner
Used to scan large items which cannot be lifted to a scanning plate.
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Sheet-feed scanner
The scanner head stays still and the paper is moved over it.
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Drum scanner
Produce very HD images.
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What is MICR?
Magnetic ink character recognition, used by banks to process checks as they have ink with magnetic particles in.
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What is a CRT monitor?
Monitor which uses cathode ray tubes that fire electrons at a screen to make each pixel glow in the correct colour. They are very big. Produce high quality images at a low cost.
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What is a TFT monitor?
Stands for thin film transistor and they use liquid crystals to form the image, they are small in size.
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What does ROM and BIOS stand for and do?
ROM (Read Only Memory) is used to load the BIOS (Basic Input/Output System) which makes the computer work.
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What is Bitmap software?
Used to create Bitmap images which split the screen into pixels, the colour of each pixel is stored. If a bitmap image is enlarged then each pixel is made bigger which reduces the quality of the image.
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What is Vector software?
Used to create vector images, these are made up of objects and the shape of each object is mathematically plotted and the quality is not affected if the image is resized.
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What should a test plan aim to improve?
Validity of data input, accuracy of output, presentation of output, solution meets the client requirements, solution is usable by the end user and/or intended audience.
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Features of a healthy workstation.
Adjustable chairs with good back support, monitors should tilt and swivel, keyboards should be adjustable in height.
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More features of a healthy workstation.
Enough work space for documents and other equipment, document holders to prevent awkward neck and eye movements, foot rests, wrist rests.
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Where would a trackball be useful?
In an enclosed space as the whole mouse doesn't need to move and it would also help people with arthritis to use a mouse as only little movements of the ball are needed to move the cursor.
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How should software be designed to aid health and safety?
Background and font colours should not cause eye strain an should be able to be seen by people with colour blindness, font size should be large enough so that reading doesn't cause eye strain, a help option should be provided to reduce stress.
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What are the different ways to identify client/user requirements?
Interview, questionnaire, looking at existing paperwork, observations.
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What needs to be included in a requirements specification?
How data will be captured, what the system has to do, how the system does this, what the user interface will be like, how information is output, how information is going to be stored.
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What is a presence check?
A check to ensure data is entered.
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What is a range check?
A check to ensure data entered is within a certain range.
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What is a format check?
A check to ensure data entered follows the correct pattern e.g. a postcode is S80 7HK not S8P OH7.
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What is a length check?
A check to ensure the correct number of characters is entered.
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What is a look up check?
A check to ensure the data entered is on a list of acceptable values.
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What is a cross field check?
A check that makes sure two fields are always entered correctly each time they are entered into a record.
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What is the difference between verification and validation?
Validation is when you check that the data entered is in a certain form so that data entry errors are reduced, verification is when data is checked against another source to ensure it is correct.
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Other cards in this set

Card 2

Front

What is a mechanical mouse?

Back

A mouse with a rolling ball on the bottom and the computer senses it's position on a flat surface, typically used on a mouse mat.

Card 3

Front

What is an optical mouse?

Back

Preview of the front of card 3

Card 4

Front

What is OMR?

Back

Preview of the front of card 4

Card 5

Front

What is OCR?

Back

Preview of the front of card 5
View more cards

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