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diff --git a/src/data/ChangeLog b/src/data/ChangeLog
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@@ -1,3 +1,117 @@
+2007-06-06  Ben Pfaff  <blp@gnu.org>
+
+	Add datasheet code.
+
+	* automake.mk: Add new files.
+
+	* datasheet.c: New file.
+
+	* datasheet.h: New file.
+
+2007-06-06  Ben Pfaff  <blp@gnu.org>
+
+	Until now, the procedure code has provided a case to the
+	case_source, which has filled in the data values that come from
+	the active file.  "Left" data values that don't come from the
+	active file naturally stay the same from case to case, because the
+	procedure code keeps using that same case.
+
+	One of the compromises that comes with the new procedure code is
+	that the active file allocates and provides its own case, which
+	the procedure code then has to resize to provide room for any
+	other variables that should go in the case and then fill in the
+	values of "left" variables.  Then, when we're done with that case,
+	we have to save the values of "left" variables to copy into the
+	next case read from the active file.
+
+	The caseinit code helps with this.
+
+	* automake.mk: Add new files.
+
+	* caseinit.c: New file. 
+
+	* caseinit.h: New file. 
+
+2007-06-06  Ben Pfaff  <blp@gnu.org>
+
+	* value.h (value_cnt_from_width): New function.
+
+	* variable.c (var_get_value_cnt): Use new function.
+
+2007-06-06  Ben Pfaff  <blp@gnu.org>
+
+	Add casegrouper, to allow cases read from a given casereader to be
+	broken into groups, each of which has its own casereader.
+	Generally cases are grouped based on having equal values for some
+	set of variables.
+
+	* automake.mk: Add new files.
+
+	* casegrouper.c: New file.
+
+	* casegrouper.h: New file.
+
+2007-06-06  Ben Pfaff  <blp@gnu.org>
+
+	Add interface to lexicographical ordering of cases.
+
+	* automake.mk: Add new files.
+
+	* case-ordering.c: New file.
+
+	* case-ordering.h: New file.
+
+2007-06-06  Ben Pfaff  <blp@gnu.org>
+
+	Add casereaders and casewriters, the basis of the new data processing
+	implementation.  A casereader is a uniform interface to reading cases
+	from a data source; a casewriter is a uniform interface to writing
+	cases to a data sink.
+
+	* automake.mk: Add new files.
+	
+	* casereader-filter.c: New file.
+	
+	* casereader-provider.h: New file.
+
+	* casereader-translator.c: New file.
+	
+	* casereader.c: New file.
+	
+	* casereader.h: New file.
+	
+	* casewriter-provider.h: New file.
+	
+	* casewriter-translator.c: New file.
+	
+	* casewriter.c: New file.
+	
+	* casewriter.h: New file.
+
+2007-06-06  Ben Pfaff  <blp@gnu.org>
+
+	"casewindow" data structure that extends the deque (from libpspp)
+	of cases with the ability to dump cases to disk if we get too many
+	of them in memory.
+
+	* automake.mk: Add new files.
+
+	* casewindow.c: New file.
+
+	* casewindow.h: New file.
+
+2007-06-06  Ben Pfaff  <blp@gnu.org>
+
+	sparse_cases data structure that augments a sparse_array of cases
+	with the ability to dump cases to disk if we get too many cases in
+	memory.
+
+	* automake.mk: Add new files.
+
+	* sparse-cases.c: New file.
+
+	* sparse-cases.h: New file.
+
 2007-06-06  Ben Pfaff  <blp@gnu.org>
 
 	Adds a low-level on-disk case array data structure.