Commit | Line | Data |
---|---|---|
a071b14a KD |
1 | .\" @(#)p4 6.1 (Berkeley) %G% |
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. |