this soulnds interesting, i wish i could participate.
our register system at mcd's is somewhat counterintuitive and can be downright confusing for some...especially customers, for example:
in most drive-thru's there's an lcd montor that displays the current order. if they say "i want a big mac no onions" that's fine, you press grill, mac, no, onion, print. fine, that works, then they say "oh, sorry i meant no pickle". alright...you hit mac,grill,mac,no,pickle,print,1,mac. then the moitor displays:
1 big mac (price goes here)
0 no onions
1 no pickle
then you've got people saying "no i just want one big mac"...jesus, please why...
i think the biggest reason for the confusion is that the register keys can be modified on a local level since most mcd's are franchises (not corporately owned restaurants). therein lies the problem of allowing unschooled individuals access to modifying the contents. personally i believe that they should just allow owners, etc. to download packages in a standardized context rather than let them dink around with the fucking buttons on that level. the owner i work for has three stores, the register keys are different in each store. when training new people i always ask them to think about driving downtown in a big confusing city, at one time, the street system made sense, then they kept adding, and adding, and adding...