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Advantages Disadvantages
They allow us to enter in correct data, checking the monitor as we go along
The Qwerty and Dvorak keyboards ease depends on the user.
Data can be entered quickly It isn’t as quick as using a MICR or OMR.
It is a strong device (Robust) Takes up space.
The concept keyboard can be of particular use to people with disabilities
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Advantages Disadvantages
They take up less space and are easy to carry around.
Due to their small size, entering the numbers may be difficult.
Easier to hide them in case of entering a PIN
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Advantages Disadvantages
It is faster to select an option using a mouse as opposed to a keyboard.
It is easy to damage them.
They increase the speed of navigation
It may be difficult for a person with disabilities.
They take up less space compared to keyboards.
They take up more time if you were to enter long passages of data. Their purpose is to make choices from a menu; clicking.
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Advantages Disadvantages
Like a mouse, it allows you to quickly chose an option.
May be found difficult for people to use.
Again like a mouse, it allows quick navigation.
Difficult to control as they are sensitive.
Hand no wire to them, built into laptops.
Again like a mouse, entering data with a lot of words can be difficult and time consuming.
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Advantages Disadvantages
Don’t require the same amount of control as a mouse.
When a button is not present to do a specific action is not present, a problem arises.
Easier for people with disabilities
Slower when selecting options.
Accuracy of where the pointer is on the screen can be increased.
Fixed into position
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Advantages Disadvantages
Video date can easily be edited.
The video files occupy a lot of space.
The output can be customized as to what format you want it.
A powerful computer and graphics card is necessary in order to edit video files.
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Advantages Disadvantages
Can be various distances from the device while still being able to operate it.
People suffering from RSI will not find it easy to use.
Beneficial to people who are unable to walk with ease.
Any obstruction in the pathway of the infrared signal from the remote to the receiver could result in no response from the device.
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Advantages Disadvantages
It is faster to choose an option using a joy stick.
Like a mouse and tracker ball, it is difficult to use when it comes to typing long passages.
Are able to control objects in 3D.
Difficulty may arise when trying to control the pointer.
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Advantages Disadvantages
Faster entry of option Screen is flat so continualuse may result in RSI.
Much more easier to select your option
Much user friendly for people with disabilities
Less likely to select an incorrect option.
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Advantages Disadvantages
Faster entry of data Damaged strip means that data entry needs to be done manually, reducing speed.
Data entry is accurate Loss of card could cause problems such as no entry to restricted areas.
It is more secure
Can be used in security systems
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Advantages Disadvantages
Can be immediately updated If the card falls in the hands of a hacker, they can access all your details and can use it for identity theft.
Are less damaged than magnetic stripreaders due to regular use.
The data that is entered is more secure than a magnetic strip
Security reasons: no entry without card.
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Advantages Disadvantages
It is very secure because it will not work without the PIN
If PIN is forgotten the card is almost useless; the transaction gets cancelled.
Time effective : using cash or cheques would require a longer time.
Great care must b taken when entering the PIN.
Chips are more indestructible than magnetic strips.
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Advantages Disadvantages
Images can be stored and then later be edited.
Limited Accuracy
Using OCR saves time rather than typing up the whole document again
Easier to scan a bar code rather than type it up.
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Advantages Disadvantages
Take a better quality picture Much more costly then traditional cameras
Easier and quicker to get them onto the computer.
Need to change the batteries more often.
Quicker than having the film developed
And the amount of photo storage is much greater
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Advantages Disadvantages
Sound can be altered whilstrecording it.
Voice recognition is not as reliable as inputting text via a keyboard.
It is much easier and much faster to input text as speech.
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Types of Sensors
How does a Sensor Work?
Advantages and Disadvantages
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Temperature sensors
• Used in automatic washing machines, automatic cookers, central heating and greenhouses.
Pressure sensors
• Used in burglar alarms, automatic washing machines, and can be used as a part of a robotic arm.
Light sensors
• Used in computer-controlled greenhouses, burglar alarm systems, automatic washing machines and street lights.
Sound Sensors
• Used in microphones and burglar alarm systems.
Humidity Sensors
• Used in computer-controlled greenhouses
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Advantages Disadvantages
Readings that are taken by sensors are much more accurate than human readings.
If there is a power failure, the sensor cannot work; therefore it is unable to take any readings.
The readings are taken at constantintervals, allowing the microprocessor to take immediate action.
Sensors are able to do all the calculations or automatic processes while humans perform other tasks.
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Advantages Disadvantages
Files that are produced can be manipulated.
It will not have the original touch of the music being played live. “The music produced can sound manufactured rather than spontaneous.
Errors can be omitted
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Advantages Disadvantages
You can alter the drawing whilst making it.
When choosing from a menu, it could be difficult.
More accurate than using a mouse
More expensive than a mouse
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Advantages Disadvantages
Security is better than that of OCR’s
The amount of characters that can be used is limited.
Accuracy is better than that of OCR.
Expensive
Cheques can be read even someone has written over them.
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Advantages Disadvantages
Quick way of entering data Manual methods of marking are more accurate.
More accurate than OCR’s Forms which can be processed by OMR’s need to planned with precision.
The user can easily fill in the form that will be read by the computer.
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Advantages Disadvantages
It is easier and faster to enter data this way rather than typing up the whole thing.
Errors are common.
Handwriting may not always be recognised.
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Advantages Disadvantages
It increases the speed. You can scan the numbers on the barcode rather than typing them up.
Expensive.
It is also more accurate
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Advantages Disadvantages
Better than barcode readers asthey still work when they are intercepted.
More expensive compared to other methods.
Can be read from and also be written to.
There is a lack of privacy as it can be used to detect the movement of people.
More difficult to copy as opposed to a barcode.
Robust
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Take moving pictures
Input to a computer
Files are then stored
Can then be incorporated
into slideshows or web pages.
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Advantages Disadvantages
Can quickly be turned on Limited facilities
Provide elders the opportunity to stay in contact with their friends and family.
Not portable
Software is also limited.
