When I first used a Paper Mate Sharpwriter led pencil borrowed from a friend, she told me that I had to twist the top to get the led out. Automatically, I knew it had some type of bad design. Even though she told me how to use the led pencil, it made sense to twist the top because the led pencil had grooves showing some type of affordance.

Although, the design of this led pencil passes most of seven principles of design, it fails the conceptual model of a led pencil. A conceptual mode shows consistency and a coherent system image of led pencils. That is, you have to twist the top of the led pencil to the right for the led to go up and twisting it to the left it goes down. Also, you can not buy led for this type of led pencil because they do not sell them in the market. The led pencil uses one long led for each pencil and when it is done you throw it out. The whole point people use led pencils is so that they can reuse that same pencil and not have to buy a new one.

A basic solution could be changing the way the led pencil twists because most of the time I would forget witch way to go since my mental model of twisting a bottle or a screw is "lefty loosey righty tighty." When twisting it to the left it should go up and when twisting it to the right it should go down. Also, the company should provide extra led and erasers when buying the pencil, so costumers are able to reuse the pencil.

The chairs in the dorm rooms are surprisingly unwell adjusted. In my dorm the chair is shaped like a rocking chair in the back of the chairs' legs. Even though the chair is simply designed and comfortable to sit on, still faces a usability problem. When I fist moved in the dorms, I took a seat on the chair and tried to lay back about half an inch and it felt like I was falling. Of course I did not fall because the chair was made to stop at a certain point. Also, when I go to place my back-pack behind the chair it causes the chair to tip back and fall. That is because of the fact that the back pack puts too much weight behind the chair that it falls backwards.

The chair fails to include any type of mapping to the users. It would be much more easier for the purpose of the users to know that the chair is also a rocking chair and to be cautious when trying to stand on the chair. This chair is unfamiliar to most people, so I do not think it was the best design to go with. Perhaps the best way of fixing this problem would be making the legs of the chair normal and not rocking when trying to do homework.