diff --git a/src/lib/test/event-log.hpp b/src/lib/test/event-log.hpp
index 671ba3e07..1d1f36b25 100644
--- a/src/lib/test/event-log.hpp
+++ b/src/lib/test/event-log.hpp
@@ -415,6 +415,18 @@ namespace test{
       EventLog& destroy (string text);
       
       
+      /** Qualify the latest entry: set further attribute(s) */
+      template<typename X, typename...ARGS>
+      EventLog&
+      addAttrib (string const& key, X&& initialiser, ARGS&& ...args)
+        {
+          REQUIRE (not isnil (*log_));
+          mutateInPlace (log_->back())
+                        .attrib(key,initialiser, std::forward<ARGS>(args)...);
+          return *this;
+        }
+      
+      
       
       
       /* ==== Iteration ==== */
diff --git a/tests/vault/gear/activity-detector-test.cpp b/tests/vault/gear/activity-detector-test.cpp
index 82457260a..105385f49 100644
--- a/tests/vault/gear/activity-detector-test.cpp
+++ b/tests/vault/gear/activity-detector-test.cpp
@@ -88,7 +88,7 @@ namespace test {
           CHECK (55 == trap (1.23, Time{FSecs{3,2}}));
           
           CHECK (detector == "Rec(EventLogHeader| this = ActivityDetector(spectre) ), "
-                             "Rec(call| fun = trap, this = ActivityDetector(spectre) |{1.23, 0:00:01.500})"_expect);
+                             "Rec(call| fun = trap, this = ActivityDetector(spectre), Seq = 0 |{1.23, 0:00:01.500})"_expect);
         }
       
       
@@ -109,14 +109,16 @@ namespace test {
           
           detector.markSequence();
           fun(rnd);
-          CHECK (detector.verifyCall ("funny"));
-          CHECK (detector.verifyCall ("funny").arg(rnd));
-          CHECK (detector.verifyInvocation ("funny", Seq(1)));
-          CHECK (detector.verifyInvocation ("funny", Seq(1), rnd));
+          CHECK (detector.verifyInvocation ("funny"));
+          CHECK (detector.verifyInvocation ("funny").arg(rnd));
+          CHECK (detector.verifyInvocation ("funny").seq(2));
+          CHECK (detector.verifyInvocation ("funny").arg(rnd).seq(2));
+          CHECK (detector.verifyInvocation ("funny").seq(2).arg(rnd));
           CHECK (not detector.verifyInvocation ("bunny"));
-          CHECK (not detector.verifyInvocation ("funny", -rnd));
-          CHECK (not detector.verifyInvocation ("funny", Seq(5)));
-          CHECK (not detector.verifyInvocation ("funny", rnd, Seq(1)));
+          CHECK (not detector.verifyInvocation ("funny").arg());
+          CHECK (not detector.verifyInvocation ("funny").arg(-rnd));
+          CHECK (not detector.verifyInvocation ("funny").seq(5));
+          CHECK (not detector.verifyInvocation ("funny").arg(rnd).seq(1));
         }
       
       
diff --git a/tests/vault/gear/activity-detector.hpp b/tests/vault/gear/activity-detector.hpp
index 9d705cc89..db2ee686d 100644
--- a/tests/vault/gear/activity-detector.hpp
+++ b/tests/vault/gear/activity-detector.hpp
@@ -155,12 +155,6 @@ namespace test {
       
       operator bool()  const { return _Parent::operator bool(); }
       
-      template<typename...ARGS>
-      ActivityMatch&
-      arg (ARGS const& ...args)
-        {
-          return delegate (&EventMatch::arg<ARGS...>, args...);
-        }
       
 //      EventMatch& locate (string match);
 //      EventMatch& locateMatch (string regExp);
@@ -175,7 +169,7 @@ namespace test {
 //      EventMatch& beforeMatch (string regExp);
 //      EventMatch& beforeEvent (string match);
 //      EventMatch& beforeEvent (string classifier, string match);
-      ActivityMatch& beforeCall (string match) { return delegate (&EventMatch::beforeCall, move(match)); }
+      ActivityMatch& beforeInvocation (string match) { return delegate (&EventMatch::beforeCall, move(match)); }
 //      
 //      
 //      /* query builders to find a match stepping backwards */
@@ -186,6 +180,22 @@ namespace test {
 //      EventMatch& afterEvent (string classifier, string match);
 //      EventMatch& afterCall (string match);
       
+      /** qualifier: additionally match the function arguments */
+      template<typename...ARGS>
+      ActivityMatch&
+      arg (ARGS const& ...args)
+        {
+          return delegate (&EventMatch::arg<ARGS...>, args...);
+        }
+      
+      /** qualifier: additionally require the indicated sequence number */
+      ActivityMatch&
+      seq (uint seqNr)
+        {
+          _Parent::attrib (MARK_SEQ, util::toString (seqNr));
+          return *this;
+        }
+      
     private:
       template<typename...ARGS>
       ActivityMatch&
@@ -219,12 +229,14 @@ namespace test {
           
           string id_;
           EventLog* log_;
+          Seq const* seqNr_;
           RetVal retVal_;
           
         public:
-          DiagnosticFun (string id, EventLog& masterLog)
+          DiagnosticFun (string id, EventLog& masterLog, Seq const& seqNr)
             : id_{id}
             , log_{&masterLog}
+            , seqNr_{&seqNr}
             , retVal_{}
             { }
           
@@ -241,7 +253,8 @@ namespace test {
           RET
           operator() (ARGS const& ...args)
             {
-              log_->call (log_->getID(), id_, args...);
+              log_->call (log_->getID(), id_, args...)
+                   .addAttrib (MARK_SEQ, *seqNr_);
               return *retVal_;
             }
         };
@@ -305,43 +318,26 @@ namespace test {
           using SigTypes = typename lib::meta::Prepend<Ret, ArgsX>::Seq;
           using Functor  = typename RebindVariadic<DiagnosticFun, SigTypes>::Type;
           
-          return Functor{id, eventLog_};
+          return Functor{id, eventLog_, invocationSeq_};
         }
       
       
-      template<typename...ARGS>
-      bool
-      verifyInvocation (string fun, Seq const& seq, ARGS const& ...args)
-        {
-          bool valid = eventLog_.verifyEvent(seq).id(MARK_INC)
-                                .beforeCall(fun).arg(args...)
-                                .beforeEvent(seq).id(MARK_SEQ);
-          if (not valid)
-            {
-              cerr << "FAIL___Function_invocation___________"
-                   << "\nfunction:"<<fun<<util::joinArgList (args...)
-                   << "\nsequence:"<<seq
-                   << "\n_______Event-Log_____________________\n"
-                   << util::join(eventLog_, "\n")
-                   << "\n───────╼━━━━━━━━╾────────────────────"
-                   << endl;
-            }
-          return valid;
-        }
-      
-      template<typename...ARGS>
-      bool
-      verifyInvocation (string fun, ARGS const& ...args)
-        {
-          return verifyInvocation (fun, invocationSeq_, args...);
-        }
       
       ActivityMatch
-      verifyCall (string fun)
+      verifyInvocation (string fun)
         {
           return ActivityMatch{move (eventLog_.verifyCall(fun))};
         }
       
+      string
+      getLog()  const
+        {
+          return "\n_______Event-Log_____________________\n"
+               + util::join (eventLog_, "\n")
+               + "\n───────╼━━━━━━━━╾────────────────────"
+               ;
+        }
+      
       
     private:
     };
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 3c28461b3..4ed5980b3 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -81743,7 +81743,8 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node COLOR="#338800" CREATED="1690900159528" ID="ID_689193567" MODIFIED="1690918955037" TEXT="Wrapper-Typ verwenden (keinen primitiven Typ)">
 <icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690899920322" ID="ID_67461983" MODIFIED="1690899953072" TEXT="den Einzel-Aufruf mit der Nummer einklammern">
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690899920322" ID="ID_67461983" MODIFIED="1691967256168" TEXT="den Einzel-Aufruf mit der Sequenz-Nummer markieren">
+<arrowlink COLOR="#fddadc" DESTINATION="ID_67251959" ENDARROW="Default" ENDINCLINATION="250;-68;" ID="Arrow_ID_996698966" STARTARROW="None" STARTINCLINATION="142;7;"/>
 <icon BUILTIN="idea"/>
 </node>
 </node>
@@ -81782,19 +81783,88 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node CREATED="1691876841330" ID="ID_1105562804" MODIFIED="1691877303577" TEXT="die EventLog-DSL verwendet daf&#xfc;r einen EventMatch(Builder)">
 <icon BUILTIN="info"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1691877252417" ID="ID_1984871622" MODIFIED="1691951648662" TEXT="diesen k&#xf6;nnte man dekorieren und erweitern">
+<node COLOR="#435e98" CREATED="1691877252417" ID="ID_1984871622" MODIFIED="1691970627322" TEXT="diesen k&#xf6;nnte man dekorieren und erweitern">
+<linktarget COLOR="#ebfec9" DESTINATION="ID_1984871622" ENDARROW="Default" ENDINCLINATION="-28;49;" ID="Arrow_ID_850495720" SOURCE="ID_761662231" STARTARROW="None" STARTINCLINATION="-304;29;"/>
 <icon BUILTIN="idea"/>
+<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1691970693305" ID="ID_19920544" MODIFIED="1691970777582" TEXT="nicht ganz einfach...">
+<richcontent TYPE="NOTE"><html>
+  <head/>
+  <body>
+    <p>
+      ...das war vom Design her nicht vorgesehen, und w&#228;re auch nicht ganz einfach zu realisieren; man m&#252;&#223;te den EventMatch per CRTP definieren (und damit m&#252;&#223;te er Header-only sein, mit den bekannten Folgen f&#252;r die Gr&#246;&#223;e des Debug-Build)
+    </p>
+  </body>
+</html></richcontent>
+<icon BUILTIN="messagebox_warning"/>
+</node>
+<node COLOR="#435e98" CREATED="1691970806346" ID="ID_1508518510" MODIFIED="1691970872329" TEXT="kann aber den R&#xfc;ckgabewert downcasten">
+<richcontent TYPE="NOTE"><html>
+  <head/>
+  <body>
+    <p>
+      ...denn dies hier ist ein geschlossenes &#214;kosystem; daher ist sichergestellt, da&#223; *this stets ein ActivityMatch ist
+    </p>
+  </body>
+</html></richcontent>
+</node>
+<node COLOR="#338800" CREATED="1691970781106" ID="ID_411948478" MODIFIED="1691970802181" TEXT="verwende abk&#xfc;rzende Notation mit Argument-Forwarding">
+<icon BUILTIN="idea"/>
+</node>
+<node COLOR="#338800" CREATED="1691970876168" ID="ID_1869522832" MODIFIED="1691970894037" TEXT="besser: privat erben und nur die wirklich ben&#xf6;tigten Funktionen forwarden">
+<icon BUILTIN="button_ok"/>
+</node>
 </node>
 </node>
 </node>
 <node CREATED="1690899978840" ID="ID_70827658" MODIFIED="1690899987515" TEXT="einen Funktionsaufruf verifizieren">
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690900023906" ID="ID_1470650457" MODIFIED="1690918796008" TEXT="markSequence()">
 <icon BUILTIN="flag-yellow"/>
+<node CREATED="1691967036611" ID="ID_1281722986" MODIFIED="1691967047702" TEXT="was bedeutet das &#xfc;berhaupt?"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1691967048250" ID="ID_1226565848" MODIFIED="1691967068615" TEXT="Ansatz: eine interne Sequenznummer hochsetzen">
+<icon BUILTIN="idea"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690900069493" ID="ID_917256156" MODIFIED="1690900150148" TEXT="verifyInvocation(fun, Seq(i), args...)">
-<icon BUILTIN="flag-yellow"/>
-<node BACKGROUND_COLOR="#f0d5c5" COLOR="#990033" CREATED="1691622557790" ID="ID_307528565" MODIFIED="1691622593416" TEXT="lenient arguments?">
+<node BACKGROUND_COLOR="#f0d5c5" COLOR="#990033" CREATED="1691967069495" ID="ID_67251959" MODIFIED="1691967245462" TEXT="wie/wo kann die zuverl&#xe4;ssig gepr&#xfc;ft werden?">
+<linktarget COLOR="#fddadc" DESTINATION="ID_67251959" ENDARROW="Default" ENDINCLINATION="250;-68;" ID="Arrow_ID_996698966" SOURCE="ID_67461983" STARTARROW="None" STARTINCLINATION="142;7;"/>
 <icon BUILTIN="help"/>
+<node COLOR="#5b280f" CREATED="1691967116385" ID="ID_1378863406" MODIFIED="1691967128672" TEXT="erste Idee: zus&#xe4;tzliche Eintr&#xe4;ge im Log">
+<icon BUILTIN="button_cancel"/>
+<node CREATED="1691967129967" ID="ID_904829426" MODIFIED="1691967134017" TEXT="einfach umzusetzen"/>
+<node CREATED="1691967134523" ID="ID_564127342" MODIFIED="1691967140537" TEXT="aber umst&#xe4;ndlich in der Handhabung"/>
+<node CREATED="1691967149276" ID="ID_291271617" MODIFIED="1691967157215" TEXT="und noch schlimmer: nicht eindeutig"/>
+<node CREATED="1691967141625" ID="ID_1932163820" MODIFIED="1691967147977" TEXT="und m&#xfc;llt das Log zu"/>
+</node>
+<node CREATED="1691967161499" ID="ID_368230212" MODIFIED="1691967174065" TEXT="das strukturierte EventLog nutzen">
+<icon BUILTIN="idea"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1691967175689" ID="ID_746233199" MODIFIED="1691967185000" TEXT="Attribut &quot;Seq&quot; einf&#xfc;hren">
+<icon BUILTIN="flag-yellow"/>
+<node CREATED="1691967277027" ID="ID_1776684493" MODIFIED="1691967284636" TEXT="Problem: Logging API">
+<icon BUILTIN="messagebox_warning"/>
+<node CREATED="1691967309343" ID="ID_244666662" MODIFIED="1691967318610" TEXT="hat typischerweise bereits eine offene Argumentliste"/>
+<node CREATED="1691967323722" ID="ID_137219277" MODIFIED="1691967342183" TEXT="man m&#xfc;&#xdf;te Erg&#xe4;nzungen oder Qualifier nutzen"/>
+<node CREATED="1691967444533" ID="ID_1942563471" MODIFIED="1691967456767" TEXT="w&#xfc;rde dann auf den letzten Eintrag wirken"/>
+</node>
+<node CREATED="1691967345874" ID="ID_1693656780" MODIFIED="1691967361490" TEXT="Record-Typ ist eigentlich immutable">
+<icon BUILTIN="messagebox_warning"/>
+<node COLOR="#fe2ee7" CREATED="1691967494714" ID="ID_1135212108" MODIFIED="1691967548854" TEXT="(es g&#xe4;be eine Hintert&#xfc;r....)">
+<font NAME="SansSerif" SIZE="11"/>
+<icon BUILTIN="smiley-oh"/>
+</node>
+<node COLOR="#5b280f" CREATED="1691967521418" ID="ID_1774670461" MODIFIED="1691967534653" TEXT="was sagt uns das??">
+<icon BUILTIN="messagebox_warning"/>
+</node>
+</node>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1691967188541" ID="ID_190903532" MODIFIED="1691967210908" TEXT="dieses dann per Zusatz-Match pr&#xfc;fbar machen">
+<icon BUILTIN="flag-yellow"/>
+</node>
+</node>
+</node>
+</node>
+<node COLOR="#5b280f" CREATED="1690900069493" ID="ID_917256156" MODIFIED="1691966998192" TEXT="verifyInvocation(fun, Seq(i), args...)">
+<icon BUILTIN="button_cancel"/>
+<node COLOR="#5b280f" CREATED="1691622557790" ID="ID_307528565" MODIFIED="1691966784058" TEXT="lenient arguments?">
+<icon BUILTIN="help"/>
+<icon BUILTIN="button_cancel"/>
 <node CREATED="1691622603918" ID="ID_85657456" MODIFIED="1691622614224" TEXT="manchmal sind die Argumente egal"/>
 <node CREATED="1691622615042" ID="ID_1956964914" MODIFIED="1691622630486" TEXT="oder man wei&#xdf; sie nicht einmal..."/>
 <node CREATED="1691622633914" ID="ID_1240512860" MODIFIED="1691622650564" TEXT="L&#xf6;sung-1">
@@ -81807,7 +81877,24 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <icon BUILTIN="stop-sign"/>
 </node>
 </node>
+<node CREATED="1691966737035" ID="ID_367147170" MODIFIED="1691966774672" TEXT="Nein! warum &#xfc;berhaupt diese Frage? &#x27f9; das ganze Design ist schlecht">
+<icon BUILTIN="stop-sign"/>
 </node>
+<node COLOR="#435e98" CREATED="1691966791292" ID="ID_761662231" MODIFIED="1691966961557" TEXT="besser: Matcher verfeinern">
+<richcontent TYPE="NOTE"><html>
+  <head/>
+  <body>
+    <p>
+      Der Ansatz, alles ein einen Pr&#252;f-Aufruf zu packen, ist insgeseamt ungeschickt; genau deshalb wurde doch f&#252;r das EventLog dieser komplizierte Builder / Verfeinerungs-Ansatz gemacht: dar&#252;ber kann man ganz nat&#252;rlich ausdr&#252;cken, wenn man etwas &#252;ber die Argumente speziell gepr&#252;ft haben m&#246;chte, oder eben nicht...
+    </p>
+  </body>
+</html></richcontent>
+<arrowlink COLOR="#ebfec9" DESTINATION="ID_1984871622" ENDARROW="Default" ENDINCLINATION="-28;49;" ID="Arrow_ID_850495720" STARTARROW="None" STARTINCLINATION="-304;29;"/>
+</node>
+</node>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690900069493" ID="ID_1755197034" MODIFIED="1691967022305" TEXT="verifyInvocation(fun).args(args...).seq(i)">
+<icon BUILTIN="flag-yellow"/>
 </node>
 </node>
 </node>