Norman's Seven Stages Of Action

Good design
Design is field on human recognition using skills and knowledge based on the recognition of human to fit their needs in the environment. Good design contributes to human needs through Norman’s “Seven Stages of Action”.

Windscreen Control of a car
Windscreen controls in a car are a good designation. The design is focused on the adaptable controls of the windscreen and side mirrors in the car. According to Norman’s Seven Stages of Action, the goal is to raise or lower the window screen of the car. Our intention directs to either press the window control down or pull it up to lower or raise the screen. We execute those actions according to the situation faced. It can be either a sunny or a rainy day that subsequent our actions. If

This is due to the surface of the button that has its curvature of gripping to press or pull the button with just a finger.
When it is done, feedback produces sound signifying the window is lowered or raised. So the mapping of the buttons on the driver’s armrest provide an easy control to press and pull all the window controls in the car.
Somehow there is a constraint that limits the movement of the buttons. One can press or push the control button only up to a certain level. Once the screen is lowered to a maximum level, the control buttons will not give any feedback. The limitation describes that window screen cannot be lowered completely however, it can only be lowered until one quarter of the screen for safety purposes.
The conceptual model gives significant effect where the window will be lowered or raised when the control button is pressed and pulled respectively

It fills the basic needs for our eyesight when we wear it. By just looking at its structure we can consider the way to wear it and determine the alternatives it gives to the users who wears it.
Since it is usable, we can also know that the functions are visible. The visibility principle is seen through the message conveyed indirectly especially when we use it, we experience a perfect vision from our eyesight.
Affordance between the characteristic and functions of the spectacles can be observed. For an example, the handles also called as temples between the sides of the specs affords holding where it gives a grip so that our fingers will not slip away while wearing the spectacles. There is a curvature at the tip of the spectacles on both sides that affords the gripping on the earpiece.
Furthermore, our nose is in between our eyes so the distance of the specs from the eyes depends on how high a nose can be because the bridge solders inhibits the movement of specs unless the nose pads are adjusted. Although the nose pads limits user’s action but it gives a good design constrain. It must be adjusted to provide a strong grip on the nose so that the spectacles remains in its position on the nose without sliding