Lots of good points being made. May I add a little one? Familiarity. In
Britain, telephone numbers are grouped in 3's, although with various
over-riding factors; my number is
0113 - 226 - 6687 
where the Leeds area code is given as four digits, then what's left is split
into 3 followed by a four digit group at the end.

In France, numbers are usually given in 2's:
01 13 22 66 68 7
(at least I think that'd be they do it). This has some advantages for
dictation, but it's really hard to handle the conversion of a number you
already know in one form. Even with new numbers, it's hard to handle the
unfamiliar system.

So I think that any experimental comparisons will need to be very careful
about checking out the subjects' prior experience.

That said, why doesn't one of you get a large sheet of paper and about 4
experienced coders and just try it out?? I'd be interested to know the
result (and I'll put a private bet on it with anyone interested!)

Thomas



----
T. R. G. Green                    also at:
preferred postal address:           Computer-Based Learning Unit
Oriel House, 27 Allerton Park,      University of Leeds
Leeds LS7 4ND, U.K.                 Leeds LS2 9JT, U.K.

0113-226-6687 (tel)
0113-226-2751 (fax)
http://www.ndirect.co.uk/~thomas.green




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