Tag Info

Hot answers tagged

430

(Older) pocket calculators sometimes have several “cancel” buttons (C, CE, etc.) Typically, the CE button would only clear the last entry but not interrupt the current computation. For example, if you press 10 + 1 CE, you would see a 0, but the calculator still expects a second operand for the addition (i.e. it still has "10 +" in memory). Often, there would ...


319

You need the bean container or filling mechanism to communicate in its physical presence alone, that it will not hold water. Additionally, emphazising what is expected, coffee beans, in form of an icon might help. This is just a crude sketch to visually show what I mean by "physically" communicating that the water does not go in here. Devise the coffee bean ...


309

Other answerers have provided great logical reasons for how these habits could come about, but I think it is simpler than that (plus, how often are any of us logical?). Calculators obviously have a state, since they do multi-step operations, but they don't clearly show their state. In many calculators, if you see a zero on the screen, you have no idea if ...


177

Besides the arguments others have listed (Aircraft requirements, power saving) we should not forget about security. Before the tablet and smartphone era you had a great control over your computer in an emergency: if you pulled the UTP cable, you could guarantee that the computer is isolated from the network. If you pulled the power cord, you could guarantee ...


163

Here in Finland the main reason is this: Image source Road markings are used to denote speed limits but never as a primary mean. And as Jung Lee points out, re-applying road paint is labor intensive, especially here, as studded tyres usually erode most of the paint in one or two winters. Edit: The Finnish law actually states that road markings, such as ...


158

In a washing machine the objects that are being washed move around. It's a dynamic process, that is unpredictable and always unique. Watching the movement is fun, it indeed gives a sense of control to the user, even if it is not actually required. Quite a few people even find it relaxing to watch the washing machine. The window also prevents users from ...


155

I believe the answer is actually because of building codes. If a room has only one entrance, it MUST open inwards. This is because if anything on the outside is blocking the door, it can still be opened, and then the person can clear the obstruction manually Trying to push the door forward might not be enough to clear the obstruction depending on a number ...


154

Security A hardware radio switch has security benefits to it in that when it is off, you know for a fact that nothing is connected to your laptop wirelessly. The radio switch usually turns off all wireless communication, including Bluetooth and 3G. I have heard that this is a requirement in certain military environments, but I have not seen any evidence ...


128

A google search doesn't really provide me any answers but I do have some ideas on why the doors would close. 1: Time Efficiency (As stated by Andrew, Ruudt, and Angelo) Closing the door reduces the time the elevator needs, to move to a different floor when someone presses the button. 2: Safety 1 When a door stays open and a user approaches the elevator ...


125

Closing the door for the floor the elevator is on reduces the time, the elevator can serve another floor upon request. The time is saved due to omitting the door closing step. Considering that elevators usually serve more than two floors this speeds up the more frequent use case.


114

I'm guessing they viewed the button on the right hand side as the primary action button as it's closer to the users thumb, with the button on the left for secondary/less-used action, as it's slightly further away from the thumb (more of a physical exertion on the user). They then may have wanted to label them accordingly - so A for primary button, B for ...


109

This wikipedia page sums it up quite nicely https://en.wikipedia.org/wiki/Intentionally_blank_page Such pages may serve purposes ranging from place-holding to space-filling and content separation. And the reason I see it most often Intentionally blank pages are usually the result of printing conventions and techniques.... Book pages are often ...


103

As you observe, connecting the machine to a water pipe removes the need to add water, but the need to add coffee leaves the user with one place to put water. So what we're looking for is a way to remove the need to add coffee; the user will then have nowhere to put the water. The solution: Mains piped coffee beans.


99

I think icons are the best possible way to convey the information about different flushing amounts. I see too much uncertainty by relying only on button relative sizes and ease of use. It can be a simple pictogram showing the tank in the relative size of water what will be flushed upon pressing that button. Or any other icons that conver relative size ...


99

You are totally right As with many other devices (eg the QWERTY keyboard) the hot/cold tap persists not because it's the most usable design, but because of: Cost since proper temperature control requires an electromechanical feedback loop design, or calibrated thermostatic valves which needs to be periodically adjusted or replaced. This drives up the cost ...


94

In the event of a stopped dishwasher (due to electrical fault or buggy software or something) the water in the device streams out of ordinary drains inside, and the water sprayers stop adding more water. If you were to open it after it had shorted out, you aren't going to get soaked. That's not true of a front-load washing machine. If one of these is ...


87

Great question! This is an good case for microinteraction design. Microinteraction objectives In descending order of priority: Provide clear affordance for user to place card/wallet on reader Provide clear feedback that the user should hold the card on the reader until an outcome. Since this is public transportation, provide blind- and deaf- friendly ...


84

Historically It is a simple fact that traffic signals were introduced in 1868. From The Origin of the Green, Yellow and Red Color Scheme for Traffic Lights: In London, England in 1865 there was a growing concern over the amount of horse-drawn traffic causing danger to pedestrians trying to cross the roads. A railway manager and engineer named John Peake ...


79

Excellent answers so far. I would attempt to connect the dots between recording and red button like this: Apart from the traditional warning usage, a red light has been used in many scenarios to represent on-going work - radio show room when on air, operation theater when operation is going on, etc. The reason behind that would be the same - it is highly ...


78

The important thing is not so much which direction is right, but that you make it visually clear which direction is 'on'. This can be done by lighting up an LED, by an icon on the display, changing colors, etc. It just needs to be very clear what state the machine is and that this button will toggle the state. This is how single direction switches (buttons) ...


75

The reason for the design was because of the technology at the time. Rotary Dial (Pulse dialing) To dial a number, the user puts a finger in the corresponding finger hole and rotates the dial clockwise until it reaches the finger stop. The user then pulls out the finger, and a spring in the dial returns it to the resting position. For example, if ...


74

On some old calculators, the clear button had double duty: push once for clear-entry push twice for clear-all I think this meant that people tended to press clear a few times, to ensure that everything was cleared. It is possible that three clicks would clear the memory as well. This is one of those habits that people acquired early on in the use of ...


68

I found an article that explains this. Apparently, in Argentina, ATMs give cash before the card, resulting in a large amount of people leaving their cards behind. See http://uxmovement.com/thinking/preventing-user-errors-in-automated-teller-machines/ - unfortunately there are no references cited so I'm unsure how true this is. To me, however, it would make ...


64

It appears to be dependent on country or region, as Wikpedia states in the article Light Switch: Up or down The direction which represents "on" also varies by country. In the USA and Canada and Mexico and the rest of North America, it is usual for the "on" position of a toggle switch to be "up", whereas in many other countries such as the UK, ...


61

Of things you might touch, you should possibly be least worried about the exit door handle (see, Enteric Bacterial Contamination of Public Restrooms, Dr. Germ: Charles P. Gerba, etc.). But, as you say, touch-free flush, sink, and soap are often available, and urine is sterile (potentially no need to wash up anyway), leaving floor, air, and door. Perhaps ...


61

OK, how about this? Should be understandable by everyone, irrespective of culture.


56

Just looked up the answer, and quite a few places seem to have the same thought. In front load washing machines, the window is given to see what is going on inside. In the top loader machine, you can open it at any time even when the machine is on wash mode but you cannot do so in front load machine, for the water will spill if you open the window ...


53

Various hotels I have come across (though I remember that primarily from China) had simple lamps with the respective do not disturb and please clean room signs next to the door and accordingly labeled switches on the inside of the room to activate either of the exterior lights. It cannot be used by anyone other than the guest. It costs somewhat more than a ...


52

Do drivers need a sign that tells them to "prepare to go, but don't go yet"? That is exactly what this signal is for. It's to stop drivers being surprised when the light turns green and gives the driver time to prepare to move off: Red and Amber— this combination of bulbs indicates that the lights are about to change to green, and gives drivers ...


52

There's this humongous article called Keyboard Trivia that has collected many of the theories and stories. The summary of facts: Touch-tone key pad was designed to mimic the rotary dial with the "1" on top and the 7-8-9 on the bottom, and AT&T conducted user testing to confirm that this configuration helped eliminate dialing errors. By the time when ...



Only top voted, non community-wiki answers of a minimum length are eligible