| A barrier |
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| • | Most
of PER on university students |
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| has
been carried out with the population |
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| of
engineers taking calculus-based physics. |
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| • | Most
of the need in AER at the university level |
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| is
for the population of non-science majors |
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| taking
non-mathematical astronomy. |
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| • | Therefore,
most results are not directly applicable. |
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| • | We
can learn something useful |
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| by
working through |
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| the
general theory of thinking and learning. |
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