diff --git a/checkin_notes b/checkin_notes
index b08917c670..1db87b17d4 100755
--- a/checkin_notes
+++ b/checkin_notes
@@ -525,3 +525,15 @@ David  16 Jan 2006
 
     client/
         acct_mgr.C
+
+David  16 Jan 2006
+    - core client: enhancements to duration correction factor (DCF):
+        - on project reset, set DCF to one.
+        - when do CPU benchmarks, scale all DCFs by new/old benchmark
+
+        (from Josef Segur)
+
+    client/
+        client_state.C,h
+        cs_benchmark.C
+        cs_scheduler.C
diff --git a/client/client_state.C b/client/client_state.C
index 054a6f8d60..ec06abe94a 100644
--- a/client/client_state.C
+++ b/client/client_state.C
@@ -1283,6 +1283,7 @@ int CLIENT_STATE::reset_project(PROJECT* project) {
         garbage_collect_always();
     }
 
+    project->duration_correction_factor = 1;
     write_state_file();
     return 0;
 }
diff --git a/client/client_state.h b/client/client_state.h
index 8dbce8c0b6..e96b1c209d 100644
--- a/client/client_state.h
+++ b/client/client_state.h
@@ -343,6 +343,7 @@ public:
     int handle_scheduler_reply(PROJECT*, char* scheduler_url, int& nresults);
     int compute_work_requests();
     SCHEDULER_OP* scheduler_op;
+    void scale_duration_correction_factors(double);
 private:
     bool contacted_sched_server;
     int overall_work_fetch_urgency;
diff --git a/client/cs_benchmark.C b/client/cs_benchmark.C
index c7fab82637..1f6239cafa 100644
--- a/client/cs_benchmark.C
+++ b/client/cs_benchmark.C
@@ -364,6 +364,7 @@ bool CLIENT_STATE::cpu_benchmarks_poll() {
         }
     }
     if (ndone == ncpus) {
+        double old_p_fpops = host_info.p_fpops;
         if (had_error) {
             msg_printf(NULL, MSG_ERROR, "CPU benchmarks error");
             host_info.p_fpops = DEFAULT_FPOPS;
@@ -403,6 +404,11 @@ bool CLIENT_STATE::cpu_benchmarks_poll() {
         );
 #endif
 
+        // scale duration correction factor according to change in benchmarks.
+        //
+        if (old_p_fpops) {
+            scale_duration_correction_factors(host_info.p_fpops/old_p_fpops);
+        }
         host_info.p_calculated = now;
         benchmarks_running = false;
         msg_printf(NULL, MSG_INFO, "Finished CPU benchmarks");
diff --git a/client/cs_scheduler.C b/client/cs_scheduler.C
index aeb4fa88b5..b1ba8ad9b9 100644
--- a/client/cs_scheduler.C
+++ b/client/cs_scheduler.C
@@ -1415,4 +1415,11 @@ double CLIENT_STATE::work_needed_secs() {
     return x;
 }
 
+void CLIENT_STATE::scale_duration_correction_factors(double factor) {
+    for (unsigned int i=0; i<projects.size(); i++) {
+        PROJECT* p = projects[i];
+        p->duration_correction_factor *= factor;
+    }
+}
+
 const char *BOINC_RCSID_d35a4a7711 = "$Id$";
diff --git a/doc/contact.php b/doc/contact.php
index 51dbef9458..53d58e7b3d 100644
--- a/doc/contact.php
+++ b/doc/contact.php
@@ -165,6 +165,7 @@ show_name("Thomas Richard");
 show_name("Nikolay Saharov");
 show_name("Alex A. dos Santos");
 show_name("Steven Schweda");
+show_name("Josef W. Segur");
 show_name("Jens Seidler");
 show_name("Peter Smithson");
 show_name("Christian S&oslash;ttrup");