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- Newsgroups: comp.human-factors
- Subject: Re: Seperation of Church and Elevators
- Message-ID: <1992Nov19.163325.662@cine88.cineca.it>
- From: bassi@cs.unibo.it (Bruno Bassi)
- Date: 19 Nov 92 16:33:24 +0100
- Sender: bassi@cs.unibo.it (Bruno Bassi)
- References: <1992Nov14.213444.25253@magnus.acs.ohio-state.edu>
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- Organization: University of Bologna, Italy
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- In article <1992Nov14.213444.25253@magnus.acs.ohio-state.edu> sruland@magnus.acs.ohio-state.edu (Shane F Ruland) writes:
- >however you rarely see them used, but on realy old Otis
- >elevators 1940's (?) And the reasoning was that going up
- >was a good thing (i.e. Heaven) and going down was a bad
- >thing (i.e. red=hell). The buttons usually carried the
- >redundant colored lights in addition to the up and down
- >arrows.
-
- The main issue about this whole thing seems to me the following:
- No matter how arbitrary the coding between an interface representation
- or action and the thing it represents or the action it stands for,
- you can *always* with some effort find some sort of "explanation" or
- mnemonic trick for it.
- But: besides the one you find, there may be other interpretations that
- come quite naturally to other people's minds, and that are misleading.
- If we are not to confuse the user, we have to look for a coding
- that has the fewer number of possible interpretations associated to it.
-
- I want to submit an example, from interfaces as supposedly "good" as
- Mac and Windows. Take a case in which I have to enter a number as a
- parameter, e.g. to set icons spacing in Windows Control Panel. I get a
- small box with the default value, and on one side of it there are two
- arrows pointing up and down. Now the idea is "push the up arrow to increment
- the number (to get a higher one), and the down arrow to decrement it.
- Folks, I ALWAYS GET IT WRONG. I do exactly the opposite, and I just
- can't learn it the right way, and no use in RTFM.
- I understand that, presented with an up-down axis (suggested by the
- arrows), I tend to imagine natural numbers disposed in a vertical row,
- like this:
-
- 0
- 1
- 2
- 3
- .
- .
-
- Try to see it this way, and you will understand how an "up" arrow could
- naturally yeald a smaller number, and conversely for the "down" one.
-
- The problem is that there are two possible interpretations of the
- "up/down" category. Is this kind of representation wrong? Well, yes, but
- I guess you could say that *only* if you are able to find a better one.
- For this particular case, I think that a horizontal representation, with
- "left" and "right" arrows, would do much better. I find it natural to think at
- the "right" direction as the direction where things increase (probably
- because texts grow rightwards). And, if you spatialise numbers, you get
-
- 0 1 2 3 4 . . .
-
- which also works.
-
- Any comments?
- Greetings, Bruno
- (bassi@cs.unibo.it)
- --
-
- ceci n'est pas un .sig virus
-