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Annotation of 43BSDReno/share/doc/usd/02.learn/p4, revision 1.1

1.1     ! root        1: .\"    @(#)p4  6.1 (Berkeley) 5/23/86
        !             2: .\"
        !             3: .NH
        !             4: Experience with Students.
        !             5: .PP
        !             6: .I
        !             7: Learn
        !             8: .R
        !             9: has been installed on
        !            10: many different 
        !            11: .UX
        !            12: systems.
        !            13: Most of the usage is on the first two scripts, so these
        !            14: are more thoroughly debugged and polished.
        !            15: As a (random) sample of user experience,
        !            16: the
        !            17: .I learn
        !            18: program has been used at Bell Labs at Indian Hill
        !            19: for 10,500 lessons in a four month period.
        !            20: About 3600 of these are in the files script,
        !            21: 4100 in the editor,
        !            22: and 1400 in advanced files.
        !            23: The passing rate is about 80%,
        !            24: that is, about 4 lessons are passed for every one
        !            25: failed.
        !            26: There have been 86 distinct users of the files script,
        !            27: and 58 of the editor.
        !            28: On our system at Murray Hill, there have been nearly 2000 lessons
        !            29: over two weeks that include
        !            30: Christmas and New Year.
        !            31: Users have ranged in age from six up.
        !            32: .PP
        !            33: It is difficult to characterize typical sessions with the
        !            34: scripts;
        !            35: many instances exist of someone doing one or two lessons
        !            36: and then logging out, as do instances of someone pausing
        !            37: in a script for twenty minutes or more.
        !            38: In the earlier version of
        !            39: .I learn ,
        !            40: the average session in the files course took 32 minutes and covered
        !            41: 23 lessons.
        !            42: The distribution is quite
        !            43: broad and skewed, however; the longest session was
        !            44: 130 minutes and there were five sessions shorter than
        !            45: five minutes.
        !            46: The average lesson took about 80 seconds.
        !            47: These numbers are roughly typical for non-programmers;
        !            48: a
        !            49: .UX
        !            50: expert can do the scripts at approximately 30 seconds
        !            51: per lesson, most of which is the system printing.
        !            52: .PP
        !            53: At present working through a section of the middle of the files
        !            54: script took about 1.4 seconds of processor time per lesson,
        !            55: and a system expert typing quickly took 15 seconds of real time per lesson.
        !            56: A novice would probably take at least a minute.
        !            57: Thus a UNIX system could support ten students working simultaneously
        !            58: with some spare capacity.

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