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- .\" @(#)p4 6.1 (Berkeley) 5/23/86
- .\"
- .NH
- Experience with Students.
- .PP
- .I
- Learn
- .R
- has been installed on
- many different
- .UX
- systems.
- Most of the usage is on the first two scripts, so these
- are more thoroughly debugged and polished.
- As a (random) sample of user experience,
- the
- .I learn
- program has been used at Bell Labs at Indian Hill
- for 10,500 lessons in a four month period.
- About 3600 of these are in the files script,
- 4100 in the editor,
- and 1400 in advanced files.
- The passing rate is about 80%,
- that is, about 4 lessons are passed for every one
- failed.
- There have been 86 distinct users of the files script,
- and 58 of the editor.
- On our system at Murray Hill, there have been nearly 2000 lessons
- over two weeks that include
- Christmas and New Year.
- Users have ranged in age from six up.
- .PP
- It is difficult to characterize typical sessions with the
- scripts;
- many instances exist of someone doing one or two lessons
- and then logging out, as do instances of someone pausing
- in a script for twenty minutes or more.
- In the earlier version of
- .I learn ,
- the average session in the files course took 32 minutes and covered
- 23 lessons.
- The distribution is quite
- broad and skewed, however; the longest session was
- 130 minutes and there were five sessions shorter than
- five minutes.
- The average lesson took about 80 seconds.
- These numbers are roughly typical for non-programmers;
- a
- .UX
- expert can do the scripts at approximately 30 seconds
- per lesson, most of which is the system printing.
- .PP
- At present working through a section of the middle of the files
- script took about 1.4 seconds of processor time per lesson,
- and a system expert typing quickly took 15 seconds of real time per lesson.
- A novice would probably take at least a minute.
- Thus a UNIX system could support ten students working simultaneously
- with some spare capacity.
-