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improve clarity and mention multiple assessment spreadsheets for categories.

\label{Spreadsheet_Hierarchy}

There are three different types of spreadsheets inside LON-CAPA: Assessment Spreadsheets, Student Spreadsheet, and Course Spreadsheet. 

\begin{enumerate}

\item \textbf{The Assessment Spreadsheets}

An assessment-level spreadsheet provides access to all of the parameters
associated with a student's performance on a particular homework assignment, quiz, 
or exam.
Each student has an assessment spreadsheet for every assessment in the course.
The assessment spreadsheets provide data to their parent, the student level
spreadsheet, via the assessment spreadsheet \textbf{export row} (\ref{Spreadsheet_Export_Row}). 
Multiple assessment spreadsheets can be used in cases where the instructor configures
grade categories.

\item \textbf{The Student Spreadsheet}

The student level spreadsheet summarizes the assessment spreadsheet data for the students.  
There is only one default student level spreadsheet definition, 
but the data varies for each student.
The student spreadsheet is programmed to permit the instructor to assign different
assessment spreadsheets for different grade categories or other uses.
The data present in the student spreadsheet is imported from the 
\textbf{export row} (\ref{Spreadsheet_Export_Row})
of each assessment spreadsheet for all of the assessments currently in 
the course.  
The student spreadsheets pass summary data to the course-level spreadsheet
via the student spreadsheet \textbf{export row} (\ref{Spreadsheet_Export_Row}).

\item \textbf{The Course Spreadsheet}

The course spreadsheet contains all of the summary data for the students in
the course.

\end{enumerate}