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- Path: sparky!uunet!olivea!apple!apple!bc
- From: bc@Apple.COM (bill coderre)
- Newsgroups: comp.sys.mac.misc
- Subject: Re: CLIs that teach; GUIs that don't
- Message-ID: <70403@apple.Apple.COM>
- Date: 24 Jul 92 00:59:53 GMT
- References: <100760001@hpcupt3.cup.hp.com> <1992Jul20.120019.73@physc1.byu.edu>
- Organization: Apple Computer Inc, Cupertino, CA
- Lines: 102
-
-
- I agree with many of the opinions expressed here, and would like to
- underline and expand a few ones that I find especially key.
-
-
-
- What makes a "good" interface?
-
- I want to agree that a good interface is one that is as "effortless"
- as possible. In this repsect, the Mac interface is great at opening
- files -- just double-click -- and a CLI-like interface is great at
- batching files -- just say "tar foo*" or something like that.
-
-
-
- Can CLI's be "good"?
-
- There are many CLI's that are particularly friendly. TWENEX, the
- preferred OS for DECSYSTEM/20's, was a CLI with some interesting
- features:
- 1. Pushing <ESC> would provide short help for a command.
- 2. Pushing <ESC> while typing a command name or file name
- would complete the name, if it was unambiguous.
-
- Note that this system provides "quick reference" help for a command
- with little effort, and also provides "power users" with a shortcut --
- all without any extra work on the part of the user. It doesn't make
- life perfect, but it does make things easier.
-
- I know that I personally would like UNIX a whole helluva lot better if
- these help modes were available. I can never remember the order of
- arguments (since it is wildly inconsistent), so features like those
- above would be especially helpful.
-
-
-
- Is the best UI one that models the way the machine works?
-
- Someone made the point that a "good" UI would educate the user about
- the machine.
-
- Although I agree that knowing a bit how your car works is a good
- thing, and might make you drive better, let me ask you a simple
- question:
- When the octane of your gasoline changes, do you want to be
- resetting your valve timing to optimize power while
- avoiding premature detonation?
-
- If you do, I can suggest that you either join a racing team or get
- more rest in your life.
-
- The point is, most people want an engine computer to save them from
- having to worry about these details, so that they can concentrate on
- finding the same radio station that the blond{e} behind them is
- singing along with.
-
- Well, that's why I bought a computer, anyway. I don't care how MS Word
- stores information -- it might be a doubly-linked list with hash codes
- and location indices, or it might be little gears and springs.
-
- All I care about is that Word creates an illusion of being a gestalt
- entity that behaves exactly like the manual, and "makes sense" to me.
- I can reason about how Word will work (OK, *most* of the time I can),
- and accurately predict the results of my tinkering.
-
-
-
- "Obvious" is not always the same as "effortless". Neither is "concise".
-
- Many people like CLI's specifically because a cryptic incantation
- can be both concise and powerful. For example:
- bc@apple% ps -aux | grep "IW" | wc
- 102 1138 6339
- You can easily see that this invocation is "effortless" -- you don't
- have to write any code, or manually compute the answer.
-
- Many other people hate CLI's for exactly the same reason! This
- invocation is far from "effortless" for them to understand. If they
- ran across it in a book, for example, they'd expect to see an
- explanation of what it does.
-
-
-
- Different levels of detail optimize "effortlessness" for different needs
-
- I think that a truly superb interface would have different levels of
- detail available when necessary, without imposing unnecessary
- "baggage" on the user. Alan Kay spawned a good metaphor when he called
- the different levels of detail "opening the hood."
-
- After all, even though my car has the engine in the back, 6
- horizontally-opposed cylinders, two carbuerators, and no fluid
- coolant, it still drives like any other car. (Only faster!)
-
- But when I need to, I can "open the hood" and turn the distributor 6
- more degrees to adjust for the fact that I've put 102 octane "low
- lead" aviation gas in the tank.
-
- bill coderre
- and his 1962-3-4-5-9 Corvair Monza Convertible.
-
- ps. No, I am not on a racing team, which I guess means that I should
- get a life!
-