A2 OCR ICT: Chapter 2 - Methods Of Interaction

Notes from OCR A2 ICT Textbook.

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Methods of Interaction: Introduction

> The designer is responsible for selecting the most appropriate method of dialogue used, the choice will depends on the investigations that have to be done, the tasks the users have and the requirements of the business.

> The type of dialogue used depends on what type of interface is being used at the time.

There are 4 main features of interaction between a computer and a person:

> Prompts

> Nature of Input

> Method Of Input

> Feedback

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Methods of Interaction: Prompts

> A prompt is most commonly used in a command line interface, it is used to tell the user that they need to input a more appropriate command.

> This type of dialogue is not appropriate for every day users as not many people are not able to use a command line interface. It is better suited for technical administrators who have more experience with this type of system.

> Prompts can also be used in GUI's (Graphical user interface's), Unlike with a command line interface, a GUI uses icons to prompt the user when an error is made. The icon should be simple and familiar to the user.

> EG. An X to close a window

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Methods of Interaction: Nature Of Input

> The nature of input depends on the interface used.

> An interactive interface decides the nature of the input based on the response to the previous input.

> EG. Asking a question or Selecting an item on a list

> Forms can be used if the the user is answering pre set questions.

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Methods of Interaction: Method Of Input

> If the dialogue is being completed by using a command line interface, then the most common method of input is a keyboard. The user will require no other peripherals.

> A form-based interfaces also use a keyboard, and although it is not required a mouse makes using forms much easier.

> Touch screens are now a popular method of input and require no other peripherals except the screen.

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Methods of Interaction: Feedback

> All dialogue's have to provide feedback

> EG. A menu that provides options for the user to select

> In a real-time or interactive interface the feedback is often very specific and limited since each response to the given questions or choices limit the responses the system can give.

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