What does principle 3: simple and intuitive mean?

Original site: https://lilaclaurasia.wordpress.com/steam/ud-principle-3/

To make things streamlined in a way that the user doesn’t have to try and do intense research just to do one simple task. To make things easy and clear for the user to be able to do exactly what they were trying to accomplish with minimal effort. IMF

What are the guidelines?

Guidelines: Eliminate unnecessary complexity. Be consistent with user expectations and intuition. Accommodate a wide range of literacy and language skills. Arrange information consistent with its importance. Provide effective prompting and feedback during and after task completion.
Background image: “Library Stair 6572” by Thorbard is licensed under CC BY-NC-SA 2.0
Information from: https://media.lanecc.edu/users/howardc/PTA103/103UniDesign2/103UniDesign29.html

Some examples:

“Elevator” by robinsonsmay is licensed under CC BY 2.0

Elevators are a perfect example of principle 3 in action, as they communicate to the user on what to do in a way that doesn’t require much effort.

There are usually buttons with an arrow pointing up and down to press, so before even entering the elevator the user can use their intuition to assume that this device moves you to different floors and what button to push on where they want to head.

It also accommodates different language and literacy skills as most buttons are easy to recognize symbols like an alarm bell or door open and close arrows.

historicair, CC BY-SA 3.0 http://creativecommons.org/licenses/by-sa/3.0/, via Wikimedia Commons

Another example of simple and intuitive design is the Rear Window Captioning System.

This system allows people to be able to use a plastic panel that would display a mirror image of captions to read, without obstructing the view of those around them.

All the user had to do was adjust it to the correct viewing angle and the captions would be ready to read during the film.

A video about UD Principle 3: