- input The user can change things; he or she can change how the machine works, or give more information to the machine.
- output After the user has given some input, the machine will do something, and then provide some output
Many machines can be very dangerous. A machine should have a user interface that can be handled easily, even if the person operating the machine has panicked. The user interface should therefore be intuitive, and simple to use. An example of such a user interface is that of the kill switch. A kill switch must shut off the machine at all costs - the idea is to avoid injury or harm to people. This is very different from shutting off the machine at the end of the shift, or when it is no longer needed.
According to EN ISO 13850, the kill switch has to be red on a yellow background.
The colors used to mark different states are close to those used by signals used on the road.
|Red||Danger||Alerting of possible danger or of states which make it very important to act immediately|
|Yellow||Something is not normal||If nothing is done, the situation may become dangerous.|
|Blue||Something needs to be done||The person operating the machine needs to do something|
|Green||Everything is normal||Used to show safe conditions, also used to start a new process.|
|White||Neutral||Confirmation, also used for things that cannot be expressed by red, yellow, blue or green.|
|Color||Meaning||What it does||Notes|
|Red||Operate in an emergency||Kill switch, stop, also used for fighting fire||Must not be used for stating/putting the machine into operation|
|Yellow||Something needs to be done to get back to normal||Re-start, Operation to avoid anormal condition or unwanted change.||Must not be used for either starting or stopping a machine.|
|Blue||Start something new||Start, Reset|
|Green||Start the usual/common procedure||Start from a safe state||Must not be used for stopping/switching off|
|White||meaning underermined||Start/On (preferred), Stop/Off|
|Black||Stop/Off (preferred), sometimes Start/On|
There may be additional symbols, for example:
|Symbol||What it does|
User interfaces are composed of one or more layers including a human-machine interface (HMI) using physical input devices such as keyboards, mice, and game pads as well as output hardware such as computer monitors, speakers, and printers. User Interface (UI) Design focuses on anticipating what users might need to do and ensuring that the interface has elements that are easy to access, understand, and use to facilitate those actions. UI brings together concepts from interaction design, visual design, and information architecture.
UI design is closely linked to user experience (UX) design. Both are crucial for the success of a digital product, and both terms are often used interchangeably. However, they’re not the same thing. UI design is the process of creating interfaces with a focus on the surface, the looks, and style, while UX design covers the entire experience a user has with a website or app.
User interface of a modern ICE train
- "What is User Interface (UI)?". Pendo.io. Retrieved 2021-09-13.
- "What is UI? Overview & Intro to User Interfaces | Adobe XD Ideas". Ideas. Retrieved 2021-09-13.
- "UI vs UX: The difference between UX and UI". RYSEN. 2021-03-20. Retrieved 2021-09-13.