diff --git a/eo/src/eo b/eo/src/eo
index eb0d8f07..0545e682 100644
--- a/eo/src/eo
+++ b/eo/src/eo
@@ -30,8 +30,20 @@
 
 // some defines to make things easier to get at first sight
 
+// tunigni the amount of output using a boolean argument: 
+// true should always mean more output
 #define eo_verbose true
 #define eo_no_verbose false
+// to be used in selection / replacement procedures to indicate whether 
+// the argument (rate, a double) shoudl be treated as a rate (number=rate*popSize)
+// or as an absolute integer (number=rate regardless of popsize).
+// the default value shoudl ALWAYS be true (eo_as_a_rate).
+//
+// this construct is mandatory because in some cases you might not know the 
+// population size that will enter the replacement for instance - so you 
+// cannot simply have a pre-computed (double) rate of 1/popSize
+#define eo_is_a_rate true
+#define eo_is_an_integer false
 //-----------------------------------------------------------------------------
 
 #include <utils/eoData.h>
@@ -86,13 +98,24 @@
 #include <eoSteadyFitContinue.h>
 #include <eoFitContinue.h>
 
-// Selection and reproduction stuff
+// Selection 
 #include <eoSelectOne.h>
 #include <eoSelectRandom.h>
 #include <eoDetTournament.h>
 #include <eoProportional.h>
 #include <eoStochTournament.h>
+#include <eoSelectPerc.h>
+#include <eoSelectNumber.h>
+#include <eoSelectMany.h>
 
+
+// Replacement
+// #include <eoReplacement.h>
+#include <eoMergeReduce.h>
+#include <eoReduceMerge.h>
+#include <eoSurviveAndDie.h>
+
+// Variation
 #include <eoProportionalCombinedOp.h>
 #include <eoProportionalOpSel.h>
 #include <eoProportionalGOpSel.h>