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Convenince labels added to the top of each file to assist in creating
index-type help files for things like the XML editor screen (where
there's nothing to hook help to).

\label{String_Response_Problems}

\textbf{\index{String Response}String Response} problems are problems in
which the student submits a string of characters for the answer. Examples
of string response questions are vocabulary tests, short answer and entering
chemical formulas.

Note that it is easy to abuse String Response problems. For instance, consider
the question {}``Who wrote 'Huckleberry Finn'?'' If you tell the system
the answer is {}``Mark Twain'', and a student answers {}``Twain'', the
system will mark it wrong. If they answer {}``Samuel Clements'', then the
student will definitely get it wrong. There is some room for flexibility
in the string processing, but it can be difficult to get it all right. Before
you use a String Response problem, be sure you can easily characterize correct
answers.
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