2.3.3 User interface

Question 1

Interface suited to

Answer 1

Users ability/ needs
Possible input devices
Memory process

Question 2

Forms Dialogue

Answer 2

User interacts with computer system by placing inputs in a form

• by selecting an option
• by entering text

- computer processes these inputs and return more options for user to select until task finished. 
User is in dialogue with System. 
- response field 
- prompt 
- error messages.

Question 3

Command line interface

Answer 3

• user type commands at command prompt.
• commands preset in a syntax
• after command- user can specify what want computer to do.
• only used by experts.

Question 4

Advantages of command line interface

Answer 4

• OS smaller- more efficient- less lines of code.
• requires disk space for RAM to operate.
• code between user and machine.
• faster for complex tasks compared to GUI.

Question 5

Disadvantages of command line interface

Answer 5

• non intuitive

- remember commands.

Question 6

WIMP

Answer 6

• type of GUI
• intuitive
• most modern computer system

Windows- each task opens in own
Icons
Menus
Painting devices.

Question 7

Inputting text using a keyboard

Answer 7

• when a key is pressed a circuit inside the keyboard is complete.
• there are enough separate circuits to match possible selection made.
• keyboard has own ROM chip which matches each circuit to a character.
• marching ASCII code sent to CPU.

Question 8

Touch screens has a capacitive touch screen.

Answer 8

• the appropriate areas of screen have a grid of small transparent electrodes.
• when pressed w finger. - electrostatic charge is altered.
• the OS of the device matches the location of the matching character.

Question 9

Inputting video

Answer 9

• captured through digital camera.
• lightens lens and focused onto sensor.
• this emits an electrical charge depending on how much light it detects.
• better sensors can pick up and individual pixels to make clearer images.

Question 10

Inputting sound

Answer 10

• captured through a digital mic
• sound waves detected by a sensor
• this converts the sound into diff amounts of electrical voltage.
• can then be converted to binary using analogue to digital converter.
• to create digital version of sound detected.

Question 11

Evaluate WIMP

Answer 11

Intuitive
Simple approach complicated tasks
Common

More computer resources enable to work

Question 12

Evaluate CLI

Answer 12

OS smaller efficient
Less disc space ram
Less code begeeen user and machine

Non intuitive
Remember commands

Question 13

Evaluate forms dialogue

Answer 13

Supports user- data entry process
EU opportunity to enter all data req. to complete current task
Step by step suit some

Limits data entry options available EU
less versatile for other computer apps