INTRODUCTION

The Human-Computer Interaction (HCI) involves two main entities

• the human entity

• the computer entity

To help in designing a usable computer system, we need to understand the human aspects from the cognitive, social, and organisational perspectives.

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2.1     VISUALISATION PERCEPTIONS

Perception is the basics of interaction between computers and users. It is the initial notion of users about particular software upon seeing its display on the computer. Thus, users should be able to determine the type of information needed upon viewing. This initial notion is very crucial, as it can determine the interest or disinterest of a user in this software.

• Vision

• Colour and Brightness

• Graphical Representation in Interface

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2.2     SOUND AND AUDITORY SKILLS

The usability goals include the following aspects:

• Attract the attention of users

• Flash warnings

• Respond to a certain action performed

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2.3     SENSE OF TOUCH

• Mainly for Visually Imparied

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2.4     DESIGN CONSIDERATION

​When designing an interface, the following should be taken into consideration:

• Choice and colour combination;

• Brightness and intensity of display;

• Response type;

• Arrangement of the information on display;

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2.5     INFORMATION ONSET DISPLAY

The arrangement of information on the interface's display is important to avoid frequent movement of eyes by users while searching for information.  As we know, the frequent movement of eyes would cause the eyes to constantly refocus, and this action would easily tire the eyes.

The considerations for designing a system interface design are:

• Does not display too much information on screen

• Does not display insufficient information on screen

• Related information is gathered into a single group

• Meaningful arrangement of information

• Important information is placed at the main division

• Less important information is placed at other divisions

• Inactive divisions are hidden.