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-* Ben Pfaff wrote most of the program and the manual.
+We wish to thank current active contributors to PSPP:
 
-* John Darrington wrote the graphical user interface, and the 
-T-TEST, ONEWAY, EXAMINE, RANK and  NPAR TESTS commands, implemented
-support for long variable names and made numerous revisions to other 
-modules.
+* Ben Pfaff wrote the initial program and manual, which comprises the
+majority of the current code. Ben continues to contribute and
+most of the core libraries which ensure that PSPP runs with optimal
+speed are his work.
+
+* John Darrington wrote the initial version of the graphical user interface,
+and many of the statistical procedures.  John also implemented support for
+long variable names, PostgreSQL and Gnumeric and made numerous
+revisions to other modules.
+
+* Jason Stover contributed statistical and numerical functionality,
+including lib/gslextras and the linear regression features. Jason
+is also an important contributor to GSL, which is used by PSPP.
+
+* Mehmet Hakan Satman provided the initial implementation of the QUICK CLUSTER command.
+  Alan Mead and others contributed later improvements including the cluster membership subcommands.
+
+* Friedrich Beckmann wrote the GRAPH command.
+
+We also thank past contributors:
+
+* John Williams wrote an initial draft of the T-TEST procedure.
+
+* Michael Kiefte contributed bug fixes and other enhancements.
+
+* Patrick Kobly contributed bug fixes and other enhancements.
+
+* Rob van Son wrote the original version of the routine for
+  calculation of the significance of the Wilcoxon matched pairs signed
+  rank statistic used by the NPAR TEST command.
 
-* Jason Stover contributed statistical and numerical
-functionality, including lib/gslextras.  (Jason is also an
-important contributor to libgsl used by PSPP.)