The design changes that most frustrate users are those that bust their habits.

Case in point. Apple re-designed the bottom navigator of the iphone mail app. See what it looked like before and what it looks like today:

Iphone_mail_bottom_nav

Notice how the 2nd slot from the bottom right used to be for replying, and after the re-design, it has become the button for deleting. So when I intended to reply to a message, my finger instinctively presses that 2nd button and now, instead of replying, the message gets deleted!

In the last few years, my finger hit that button thousands of times whenever the brain said to reply. Now, it's really hard to change this habit. I kept having to undo the delete. It's frustrating beyond belief.

This also shows the habit is in the muscle memory, and I'm no longer paying attention to the visual icon. A more direct dataviz analogy is when you belatedly discovered that the horizontal axis in a line chart isn't representing time because you didn't read the axis labels.

***

A similar thing happened inside an elevator (lift) recently.

Most elevator panels place the Door Open and Door Close buttons side by side. Typically, the Door Open is on the left and the Door Close is on the right.

This particular elevator panel has the Door Open button on top, and Door Close at the bottom, laid out vertically. To the right of the Door Open button is the Alarm button! So I sounded the Alarm when I intended the doors to close.

(I didn't take a photo at the time. The figure on the right is a rough sketch of what the panel looked like.)

Junkcharts_elevatorpaneldesign

I bet the alarm is pressed multiple times a day by mistake.

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