A GUI (pronounced gooey) is a graphical user interface. It is the most common type of user interface used today. It makes use of pictures, graphics and icons – hence why it is called ‘graphical’ and is considered a user friendly interface. A GUI uses a WIMP interface because it makes use of: 

• Windows – each application opens in its own window 

• Icons – a picture or symbol which is used to represent a software application or hardware device 

• Menus – a list of options from which the user can choose what they require 

• Pointers – this helps you make a selection on screen e.g. a mouse 

Advantages 

• Accessible for users of all abilities 

• Don’t have to learn complicated instructions to use it

• Intuitive 

Disadvantages

• More experienced users find this type of interface slower to use

• Takes up a lot of storage space 

• Requires more processing power than other interfaces 

In this interface the user speaks or types in their normal everyday language in order to interact with the computer. 

For example, some applications such as speech recognition software accept spoken words and convert them into text on the computer. These applications have a much wider vocabulary than the dialogue interface. 

Advantages 

• No training required to use the interface

• More flexibility than a dialogue interface

• Suitable for people with disabilities

Disadvantages 

• The interface can only understand commands that it has been programmed to understand 

• Difficulty understanding different accents and slang 

• A voice interface might need training in order to get the software to recognise what the user is saying 

This type of interface uses sensors to monitor head and hand movements. It works with virtual reality and is a relatively new technology. It digitises your movement for use in software. 

Advantages 

• Gives real life experience of a situation

• Easy to use as it allows for natural movements

Disadvantages

• Require the necessary technology such as headsets and handsets to llow the user to interact with it 

• Health and safety can be an issue – users need to be aware of the space around them when wearing a headset 

Touch screens can be found on many mobile devices such as a smart phone or a tablet computer. They work by using your finger to touch the screen. The interface detects where the pressure is applied on screen and follows out the corresponding instruction. As well as tapping, the screen can sense swiping and pinching actions. Examples: ATMs have a touch sensitive screen where you can use your finger to select a service such as withdrawing cash, seeing your balance or ordering a statement. Photo Printing Kiosks have touch sensitive screens to allow you to print photos from a device. You can select different sizesof photograph, the paper used and quantities required. 

Advantages 

• Easy to use for both experienced and inexperienced users

• Can be used in a range of different places

• More secure in public places than keyboards and mouse 

Disadvantages 

• Can get dirty especially when used in public places 

• Can only offer limited options 

• Need to understand the meaning of icons