If, as you say, as many as half your users aren't English speakers, why are you trying to communicate with them using English words?
Why not show the Lira symbol (or better, some Lira banknotes) and arrows to the PayPal logo, pictures of your gift cards (or icons of gifts) etc.?
Create a clearly noticeable "back to start" button. Work from the following user stories:
A new user comes to the screen and sees lots of stuff they don't understand. They realize that this is the input from the last user and realize that they should push the "back to start" button to clear the session.
A user is in the middle of a session. He is curious ...
Standards don't matter if your goal is speed on this extremely simple screen. It seems like the ideal scenario for simple a/b user testing.
Gather timing data for each version. If one is completed significantly faster than the other then you have your answer.
I think showing the keyboard by default causes the customer to pause to think too much...
why is the keyboard loaded?
what did I click on to load the keyboard?
what field will i be typing into if I haven't clicked on anything?
this doesn't do this on my iPad at home
If this is occasional use, you don't have much persuasion time to change the normal ...
I would let the first user do the entire registration:
they log on as normal
they register for the team event
at this point, the software asks them to enter the name of the second person.
Similar to when you book flights online; you enter the name and password number of your partner who's flying with you, but they don't need to also register themselves.
What we usually do is add an area on the screen that is not a visible action item (e.g. one of the corners of the screen, or a section of a logo), and require the admin to press on it for a few seconds (somewhere between 3 and 6, usually), without any visible feedback until the full time of course.
If using a touch screen, make sure it’s wide enough for a ...
Utilize existing UI to invoke a number pad to input passcode
Your first idea, combination of keystrokes to pull up a login mode makes the most sense. A hidden button or a button on the splash screen are likely to pressed by accident or out of curiosity.
Holding Key Combinations
As with certain computer hardware, where in order to enter certain modes it's ...
Yes there are. They are described in detail in About Face 3 (by Alan Cooper) and maybe earlier versions as well (I can't check since I only have version 3). The main guielines are:
Make your click/touch targets large enough: 20 mm should be enough.
Use soft-keyboard input sparingly: awkward for user and creates lots of fingerprints (which make the screen ...
Also look here: CASSM and cognitive walkthrough: usability issues with ticket vending machines. It's a "cognitive Walkthrough, to identify usability issues underlying the use made of two London Underground ticket vending machines."
There are could be a bunch of cases, I don't know all of your requirements and context. There are some factors which influence user interaction:
if the event registration process is momentary, i.e. requires the presence of both users at the same time and place? Then your option 2 is good. The second user could enter his data and confirm, so the first user ...