4 Design principles

Design interface 

Different types of design principles to consider when writing about usability of design.

Visibility: the more visual the function is the more easier it will be for the user. In contrast, when functions are out of sight, it makes them more difficult to find and how to use. The voice mail system in presence and number of waiting messages are waiting, when the system made the number of waiting waiting messages more highly visible.

Feedback: related to the concept of the visibility concept feedback, this is best illustrated by everyday life would be without it. imagine trying to play a guitar, slice a bread or write with a pen if none of the actions produced any affect for several seconds. Feedback is about sending back information about what action has done and has been accomplished, allowing the person to continue with the activities, various kind of feedback are available for interactive design. For example for a phone when you go to make a call you dial a number you get a feedback of the number you dialling. with phones you get feedback visual in whatever you. this could be messages, apps literally anything.

 Constraints:  The design constraint refers to determining ways of restricting the kind of user interaction can take at a place in a given moment. Cultural constraint rely on conventions. The use of red for warning and other certain types of warning. According this needs to be learned and once learned must be adapted to cultural group. For example; for a mobile phone it will be the green to answer and red to decline. Some culture this could be green on the left and right for red, but in some culture this might not be the case, you will find the red on the right and green on the left. So is important to remember culture restraint in doing user interaction. Another example will be the keyboard will be different and differently layout to suit the culture.

Mapping: This refers to relationship and their affects in the world. Nearly all need some kind of mapping between controls and affects, flashpoint, car, power plant, mobile phone and cockpit. For example; using a iphone you can touch with your finger and resize or touch to go anywhere do anything. play music on your phone its like a computer in your hand you control, it is easy for anyone to use.