5.1 Subjective metrics
procedure: 1) read a short document of background
Our main resource for investigating the effect of
material, 2) took a pretest to measure initial phys-
the NM was the system questionnaires given after
ics knowledge, 3) worked through 2 problems with
each problem. These questionnaires are identical
benefit from access to the discourse structure in-
formation. These questions probe the user’s per-
and include 16 questions that probed user’s percep-
ception of ITSPOKE during the dialogue. We find
tion of ITSPOKE on various dimensions. Users
were asked to answer the questions on a scale from
that for 6 out 7 questions the NM presence has a
significant/trend effect (Table 1, column 2).
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