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Updating chapter 15 of cc manual.

    1: \label{Spreadsheet_HowTo_Assessments}
    2: 
    3: \textbf{How to deal with multi-part problems}
    4: 
    5: Often, there are several parts in a specific problem. For example, a
    6: problem with three parts would have parts 0, 11, 12, and 13. For a
    7: general spreadsheet, it is not often desirable to sum up all of these
    8: parts, while not knowing how many parts there are as the spreadsheet
    9: is written.
   10: 
   11: The spreadsheet has a preprocessor which can expand a symbolic
   12: expression over all symbolic names that fit. The general syntax is
   13: \index{EXPANDSUM} \texttt{[\&EXPANDSUM(VARNAME;expression)]}. 
   14: 
   15: For example, for the above assessment with three parts,
   16: 
   17: \texttt{\&EXPANDSUM(}\texttt{\textbf{PART}}\texttt{;parameter\_}\texttt{\textbf{PART}}\texttt{\_weight{*}stores\_}\texttt{\textbf{PART}}\texttt{\_awarded)}\\
   18: would become
   19: \texttt{parameter\_0\_weight{*}stores\_0\_awarded +}~\\
   20: \texttt{parameter\_11\_weight{*}stores\_11\_awarded +}~\\
   21: \texttt{parameter\_12\_weight{*}stores\_12\_awarded +}~\\
   22: \texttt{parameter\_13\_weight{*}stores\_13\_awarded +}~\\
   23: where \textbf{bolded text} is used to highlight what the
   24: \texttt{\&EXPANDSUM} function is doing.
   25: 
   26: \noindent
   27: \textbf{What 'tries' means}
   28: 
   29: In multi-part questions, the exported value for "tries"\index{tries} is now 
   30: the average number of tries to get the parts right. 
   31: The full data for each part is still stored by the system.