HCI Question 1 – 100 points:
The interface for a typical elevator is still based on physical buttons that allow the user to select a specific floor, hold the door open, close the door, or ring the alarm bell. With the price of flat panel displays dropping, it is possible that in the coming years we will see touch screen LCD panels replacing the existing designs.
A – What are the advantages of completely replacing a typical elevator button panel like the one
shown below with a touch-screen LCD panel?
Completely replacing the panel would allow for more information to be presented. There would be fewer individual mechanical pieces that could go faulty. Particularly in the case of some mechanical error, the LCD screen could provide information about what had happened to the caller to be relayed to the technician.
B – What are the disadvantages of that complete replacement?
With all changes there is a learning curve, and the newness may cause some confusion. Going beyond that, an LCD screen is unlikely to provide the same immediate feedback when a 'button' is pushed.
C – Suggest a hybrid design combining the current interface and an LCD touch screen that
maximizes the advantages and minimizes the disadvantages. Note which principles you
are using and how they affect your design.
HCI Question 2 – 33 points:
On some computer systems, using a mouse to move the cursor to the corner of the screen causes the system to sleep or go into alternative display modes. Is this a Fitts’ task? Explain your answer.
Yes, this task is a Fitts task. Since Fitts' Law deals with the placement and utilization of space for the distribution of objects for a task, placing the most frequently used objects near the center of the task, the act of placing a common task that shouldn't interfere with normal use at the edges of the screen falls under that umbrella of tasks.
HCI Question 3 – 34 points:
Touch-screen interactions often face the problem that the user’s finger occludes the object being
manipulated (e.g., selected, moved).
A - Describe two techniques that might potentially mitigate this problem, and discuss the
advantages and disadvantages of each technique.
One technique would be to have an offset of the touch, displaying the selection as slightly above(to avoid occlusion by the rest of the finger) of the contact. The advantage of this technique
B - Describe a procedure (including subjects, tasks, and analysis methods) for characterizing the
performance of the two proposed methods.
More later. Need to go back to foundations and really hard core study so...backing away from this for now. I feel this is easier and more comfortable than hard comp sci, and that's not cool.
I have a few comments for discussion. :)
ReplyDeleteQuestion 1: There are some more disadvantages to an LCD screen, imo. First, of all, if power goes out to the elevator the user gets no feedback. One would have to be sure that the power is always on, and in some cases (most cases) this might be clumped with non-emergency lighting (MIGHT be).
Also, LCD screens are very hard for the visually impaired to read, in some cases. The lighting can hit the screen in such a way that there is glare.
Also, what about the blind? They could not "feel" the buttons and orient which floor they wanted simply by feeling the display. An LCD, obviously, is not a good choice here...
Also, the "life" of an LCD is much shorter than the life of buttons. Buttons do not only NOT depend on light, but they are more hardy in terms of being pushed repeatedly. An LCD would begin to show wear as the cells are much more fragile. Also, a dirty LCD is worse than a dirty panel of buttons...
Question 2:
Because Fitt's law deals with the level of difficultly of pressing a button given some distance, it MAY be partially a Fitt's thing, but also I could argue that it is not PURELY a Fitt's thing. Perhaps there is no constraint in simply placing a mouse into a corner as there is no predefined area, which is definitely examined in Fitt's Law! Without a size, then the time to get there for the given size is irrelevant. Hopefully you see what I mean. Yes, this is a moving task, but without a size of a button to press, it really is not a difficult task under any latency to respond.
So I'd argue it was some sort of hybrid task. :)
No comments on question 3 - too much.... lol
Just my thoughts!