Push me. Wait… you can’t

The ATM example suffers from some misrepresentation. The labels for the physical buttons are styled with bevels, commonly used to represent buttons in GUIs. As a result, many users try to press them, only to realize after a few attempts that the buttons are actually to the right and left of each label. In this case, objects give off an inaccurate perceived affordance.

It’s not uncommon for ATMs to have physical buttons and digital label displays. In this situation, it looks like someone thought that adding a little visual “excitement” to the labels would be an improvement. If simple, plain text labels had been used, people would most likely have experienced less confusion.

Where’s the Button?

In the gas pump example people tended to press the octane number, as evidenced by the fingerprints around the “87″, when choosing a fuel. This happened despite the “Push to start” label on the actual button and the arrows pointing to them. In this case, there isn’t enough emphasis given to the real button in comparison to the large yellow square label. Which begs the question, why not just make the yellow square the button to begin with?

Which way is up?

In our last perceived affordances example, we have three components, all with a triangle/arrow pointing up, all beveled from the panel on which they are presented. Which one do you push to direct the elevator up?

The two arrows on the top are lights, which indicate the direction the elevator is traveling, while the lower button is the actual call button. Many users pressed the lights in order to call the elevator. Why? Most likely because the bevel caused people to perceive them as buttons. Also, the lights have a higher visual significance than the smaller triangle on the actual button. Had there simply been no bevel around the two lights, it’s likely there would be less confusion and more people would find the real button first. That’s not to say that the button itself couldn’t use a bit more visual prominence in it’s display too.

Follow the Arrows

In the example to the right, there appears to be some attempt at sequencing in the digital display as well as from the large “2″ at the bottom of the device. In this case however, some considerate and/or frustrated individual(s) has taken it upon themselves to try to make up for the devices inadequacies by adding additional instructions and labels.

Easy as 1, 2, 3

Our second example also uses numbers, in addition to a list of instructions, to provide guidance. Yet the arrangement of components and labels gives a perception of chaos that even a well written set of instructions can’t overcome.

Both of these interfaces exemplify that in user interface design, identifying a sequence of actions is not enough. Numbers and lists, while somewhat helpful, should be used in conjunction with a logical and sequential arrangement of controls and inputs.