diff --git a/src/vault/gear/activity.hpp b/src/vault/gear/activity.hpp
index 9a53e7060..c4273f4f9 100644
--- a/src/vault/gear/activity.hpp
+++ b/src/vault/gear/activity.hpp
@@ -169,6 +169,7 @@ namespace gear {
        ASSERT_MEMBER_FUNCTOR (EXE::work, void(Time, size_t));
        ASSERT_MEMBER_FUNCTOR (EXE::done, void(Time, size_t));
        ASSERT_MEMBER_FUNCTOR (EXE::tick, Proc(Time));
+       ASSERT_MEMBER_FUNCTOR (EXE::spin, Time(Time));
 
       
 #undef ASSERT_MEMBER_FUNCTOR
@@ -441,8 +442,13 @@ namespace gear {
       activity::Proc
       checkGate (Time now, EXE& executionCtx)
         {
-          UNIMPLEMENTED ("evaluate GATE condition and branch accordingly");
-          return executionCtx.post (now, *next, executionCtx);
+          REQUIRE (GATE == verb_);
+          if (now > data_.condition.dead)  // beyond deadline
+            return activity::SKIP;
+          if (0 < data_.condition.rest)    // prerequisite count not(yet) fulfilled -> spin (=re-invoke later)
+            return executionCtx.post (executionCtx.spin(now), *this, executionCtx);
+          else
+            return activity::PASS;
         }
       
       template<class EXE>
diff --git a/tests/vault/gear/activity-detector-test.cpp b/tests/vault/gear/activity-detector-test.cpp
index 0d64687cd..dd6d8b990 100644
--- a/tests/vault/gear/activity-detector-test.cpp
+++ b/tests/vault/gear/activity-detector-test.cpp
@@ -336,8 +336,15 @@ namespace test {
       
       
       
-      /** @test TODO diagnostic setup to watch Activity::GATE activation
-       * @todo WIP 7/23 🔁 define ⟶ implement
+      /** @test diagnostic setup to watch Activity::GATE activation
+       *        - when applied, Tap will be inserted before and after the
+       *          instrumented GATE-Activity
+       *        - it can thus be traced when the Gate is activated,
+       *          but also when the Gate condition is met and the `next`
+       *          Activity after the Gate is activated
+       *        - for this unit-test, a Gate and a follow-up Activity
+       *          is invoked directly, to verify the generated log entries
+       * @todo WIP 7/23 ✔ define ✔ implement
        */
       void
       watch_gate()
@@ -353,8 +360,13 @@ namespace test {
           
           Time tt{5,5};
           wiring->activate(tt, detector.executionCtx);
+          ++detector;
+          wiring->next->activate(tt, detector.executionCtx);
           
-          cout<<detector.showLog()<<endl;
+          CHECK (detector.verifyInvocation("tap-GATE").seq(0).timeArg(tt)
+                         .beforeSeqIncrement(1)
+                         .beforeInvocation("afterGATE").seq(1).timeArg(tt)
+                         .beforeInvocation("CTX-tick").seq(1).timeArg(tt));
         }
     };
   
diff --git a/tests/vault/gear/activity-detector.hpp b/tests/vault/gear/activity-detector.hpp
index 1ec565dfe..8eb85c1c3 100644
--- a/tests/vault/gear/activity-detector.hpp
+++ b/tests/vault/gear/activity-detector.hpp
@@ -106,6 +106,8 @@ namespace test {
 //  using lib::diff::MakeRec;
   using lib::time::TimeValue;
   using lib::time::Time;
+  using lib::time::FSecs;
+  using lib::time::Offset;
 //  using lib::HashVal;
   using lib::meta::RebindVariadic;
   using util::isnil;
@@ -129,6 +131,8 @@ namespace test {
     const string CTX_WORK{"CTX-work"};
     const string CTX_DONE{"CTX-done"};
     const string CTX_TICK{"CTX-tick"};
+    
+    Offset SPIN_DELAY{FSecs(1)};
   }
   
   class ActivityDetector;
@@ -503,18 +507,17 @@ namespace test {
         }
       
       Activity&
-      buildGateWatcher (Activity& gate)
+      buildGateWatcher (Activity& gate, string id ="")
         {
-          Activity& watcher = buildActivationTap (gate);
-          insertActivationTap (gate.next, "after"+gate.showVerb()+util::showAddr(gate));
-          return watcher;
+          insertActivationTap (gate.next, "after" + (isnil(id)? gate.showVerb()+util::showAddr(gate) : id));
+          return buildActivationTap (gate, id);
         }
       
       Activity&
-      watchGate (Activity*& wiring)
+      watchGate (Activity*& wiring, string id ="")
         {
-          wiring = wiring? & buildGateWatcher (*wiring)
-                         : & buildActivationProbe ("tail-"+util::showAddr(&wiring));
+          wiring = wiring? & buildGateWatcher (*wiring, id)
+                         : & buildActivationProbe (isnil(id)? "tail-"+util::showAddr(&wiring) : id);
           return *wiring;
         }
       
@@ -539,6 +542,8 @@ namespace test {
           _DiagnosticFun<SIG_done>::Type done;
           _DiagnosticFun<SIG_tick>::Type tick;
           
+          static Time spin (Time now) { return now + SPIN_DELAY; }
+          
           FakeExecutionCtx (ActivityDetector& adi)
             : post{adi.buildDiagnosticFun<SIG_post>(CTX_POST).returning(activity::PASS)}
             , work{adi.buildDiagnosticFun<SIG_work>(CTX_WORK)}
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 0b3d24fbf..1836e0d16 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -77840,7 +77840,7 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1681086215092" ID="ID_688439359" MODIFIED="1692323864648" TEXT="Activity">
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1681086215092" ID="ID_688439359" MODIFIED="1692489346733" TEXT="Activity">
 <linktarget COLOR="#f4fec9" DESTINATION="ID_688439359" ENDARROW="Default" ENDINCLINATION="-557;-136;" ID="Arrow_ID_1352278228" SOURCE="ID_1926192234" STARTARROW="None" STARTINCLINATION="1598;114;"/>
 <linktarget COLOR="#daf1b4" DESTINATION="ID_688439359" ENDARROW="Default" ENDINCLINATION="-190;833;" ID="Arrow_ID_345974066" SOURCE="ID_1628186610" STARTARROW="None" STARTINCLINATION="2086;-130;"/>
 <icon BUILTIN="pencil"/>
@@ -78447,6 +78447,9 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node CREATED="1690069554609" ID="ID_467087304" MODIFIED="1690069556663" TEXT="&#x3bb;-tick">
 <node CREATED="1690740728730" ID="ID_1262348056" MODIFIED="1690746330626" TEXT="(Time)  &#x27fc; activity::Proc"/>
 </node>
+<node CREATED="1692489173543" ID="ID_897346987" MODIFIED="1692489185929" TEXT="&#x3bb;-spin">
+<node CREATED="1692489192676" ID="ID_1486708865" MODIFIED="1692489198415" TEXT="(Time)  &#x27fc; Time"/>
+</node>
 </node>
 <node CREATED="1690490265626" ID="ID_691752926" MODIFIED="1690490274359" TEXT="wird eingebunden als Template-Parameter">
 <node COLOR="#338800" CREATED="1690490280656" ID="ID_1134844863" MODIFIED="1690490315482" TEXT="direkt in Activity selber">
@@ -78649,23 +78652,23 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690069961163" HGAP="-57" ID="ID_1647246120" MODIFIED="1690070058095" TEXT="brauche Diagnose-Hilfsmittel" VSHIFT="4">
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1690069961163" HGAP="-57" ID="ID_1647246120" MODIFIED="1692491427946" TEXT="brauche Diagnose-Hilfsmittel" VSHIFT="4">
 <arrowlink COLOR="#794f4b" DESTINATION="ID_284088835" ENDARROW="Default" ENDINCLINATION="-685;-107;" ID="Arrow_ID_1213725911" STARTARROW="None" STARTINCLINATION="518;48;"/>
-<icon BUILTIN="flag-yellow"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690070237908" HGAP="43" ID="ID_875825086" MODIFIED="1690070258681" TEXT="Test-Setup mit &#x3bb;-Stubs" VSHIFT="-3">
+<icon BUILTIN="pencil"/>
+<node COLOR="#338800" CREATED="1690070237908" HGAP="43" ID="ID_875825086" MODIFIED="1692491405654" TEXT="Test-Setup mit &#x3bb;-Stubs" VSHIFT="-3">
 <arrowlink COLOR="#7ba8d3" DESTINATION="ID_596906210" ENDARROW="Default" ENDINCLINATION="76;284;" ID="Arrow_ID_1248869383" STARTARROW="None" STARTINCLINATION="990;-88;"/>
-<icon BUILTIN="flag-yellow"/>
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690070107384" HGAP="31" ID="ID_396064852" MODIFIED="1690070255409" TEXT="ActivityDetector f&#xfc;r Me&#xdf;unkte" VSHIFT="-13">
-<icon BUILTIN="flag-yellow"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1689205105640" ID="ID_1873547897" MODIFIED="1690070157925" TEXT="Funktor-Aufruf erkennen">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1690070107384" HGAP="31" ID="ID_396064852" MODIFIED="1692491421971" TEXT="ActivityDetector f&#xfc;r Me&#xdf;unkte" VSHIFT="-13">
+<icon BUILTIN="button_ok"/>
+<node COLOR="#338800" CREATED="1689205105640" ID="ID_1873547897" MODIFIED="1692491417479" TEXT="Funktor-Aufruf erkennen">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1689205129709" ID="ID_1799160243" MODIFIED="1690070171707" TEXT="stattgefundene Invocation erkennen">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1689205129709" ID="ID_1799160243" MODIFIED="1692491419052" TEXT="stattgefundene Invocation erkennen">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1689205423173" ID="ID_206179585" MODIFIED="1690070228859" TEXT="Gate beobachten">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1689205423173" ID="ID_206179585" MODIFIED="1692491420712" TEXT="Gate beobachten">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
 </node>
@@ -81666,10 +81669,10 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node COLOR="#338800" CREATED="1689204913954" ID="ID_256874849" MODIFIED="1689204922646" TEXT="f&#xfc;r ExtentFamily">
 <icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1689204967974" ID="ID_284088835" MODIFIED="1690070044262" TEXT="ActivityDetector">
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1689204967974" ID="ID_284088835" MODIFIED="1692491465813" TEXT="ActivityDetector">
 <linktarget COLOR="#794f4b" DESTINATION="ID_284088835" ENDARROW="Default" ENDINCLINATION="-685;-107;" ID="Arrow_ID_1213725911" SOURCE="ID_1647246120" STARTARROW="None" STARTINCLINATION="518;48;"/>
 <linktarget COLOR="#5f8998" DESTINATION="ID_284088835" ENDARROW="Default" ENDINCLINATION="347;-1232;" ID="Arrow_ID_1573724609" SOURCE="ID_373470992" STARTARROW="None" STARTINCLINATION="634;35;"/>
-<icon BUILTIN="flag-yellow"/>
+<icon BUILTIN="pencil"/>
 <node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1689204985122" ID="ID_1020676746" MODIFIED="1690832427037" TEXT="Rahmen schaffen">
 <icon BUILTIN="pencil"/>
 <node COLOR="#338800" CREATED="1689205014901" ID="ID_221497246" MODIFIED="1690832378644" TEXT="Instantiierung und Lebenszyklus">
@@ -81763,6 +81766,9 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </html></richcontent>
 <icon BUILTIN="messagebox_warning"/>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1692489058101" ID="ID_1423312805" MODIFIED="1692489067676" TEXT="auch f&#xfc;r Notifications geeignet ber&#xfc;cksichtigen">
+<icon BUILTIN="flag-yellow"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1689205029658" ID="ID_1144318045" MODIFIED="1690918967997" TEXT="Verifikationen">
 <icon BUILTIN="pencil"/>
@@ -82059,6 +82065,10 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node CREATED="1690069365933" ID="ID_832098393" MODIFIED="1692286755765" TEXT="&#x3bb;-work: (Time, quality)"/>
 <node CREATED="1690069480630" ID="ID_320780008" MODIFIED="1692286762564" TEXT="&#x3bb;-done: (Time, quality)"/>
 <node CREATED="1690069554609" ID="ID_761100089" MODIFIED="1692286770500" TEXT="&#x3bb;-tick: (Time)  &#x27fc; activity::Proc"/>
+<node CREATED="1692489219616" ID="ID_866525795" MODIFIED="1692489234875" TEXT="&#x3bb;-spin">
+<node CREATED="1692489235982" ID="ID_1555747732" MODIFIED="1692489243923" TEXT="hier fest verdrahtet (ohne Logging)"/>
+<node CREATED="1692489245061" ID="ID_350410985" LINK="#ID_1726593706" MODIFIED="1692489280665" TEXT="liefert re-Check-Zeit"/>
+</node>
 </node>
 <node COLOR="#338800" CREATED="1692286383148" ID="ID_675137089" MODIFIED="1692323862104" TEXT="diese sind per Log verifizierbar">
 <icon BUILTIN="button_ok"/>
@@ -82284,14 +82294,17 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 <node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1689205423173" ID="ID_935068564" MODIFIED="1692487675023" TEXT="watchGate">
 <icon BUILTIN="pencil"/>
-<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1692485210898" ID="ID_1284233307" MODIFIED="1692485224634" TEXT="komplexe Aufgabe">
+<node COLOR="#435e98" CREATED="1692485210898" ID="ID_1284233307" MODIFIED="1692491324320" TEXT="komplexe Aufgabe">
 <icon BUILTIN="messagebox_warning"/>
 <node CREATED="1692485226036" ID="ID_1556332540" MODIFIED="1692485237497" TEXT="das Gate bietet eigentlich keine Erweiterungspunkte"/>
 <node CREATED="1692485238133" ID="ID_904790600" MODIFIED="1692485265925" TEXT="zudem m&#xfc;ssen mehrere Ein/Ausg&#xe4;nge &#xfc;berwacht werden"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1692487689444" ID="ID_1980202996" MODIFIED="1692487705987" TEXT="sinnvolle IDs f&#xfc;r die Verifikation erzeugen">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1692487689444" ID="ID_1980202996" MODIFIED="1692491327388" TEXT="sinnvolle IDs f&#xfc;r die Verifikation erzeugen">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
+<node COLOR="#338800" CREATED="1692489331442" ID="ID_1512727338" LINK="#ID_1768827754" MODIFIED="1692489388011" TEXT="siehe GATE-impl">
+<icon BUILTIN="info"/>
+</node>
 <node COLOR="#338800" CREATED="1692485300157" ID="ID_1563739402" MODIFIED="1692487715332" TEXT="ActivityProbe vorschalten">
 <icon BUILTIN="button_ok"/>
 <node CREATED="1692485311859" ID="ID_1216045769" MODIFIED="1692485364424" TEXT="diese kann Aktivierung aufzeichnen">
@@ -82303,8 +82316,16 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 <node COLOR="#338800" CREATED="1692485417998" ID="ID_856616436" MODIFIED="1692487971912" TEXT="zudem Probe auf den next-Ptr legen">
 <icon BUILTIN="button_ok"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1692485434421" ID="ID_1307528934" MODIFIED="1692487980102" TEXT="passende ID hierf&#xfc;r vergeben">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1692485434421" ID="ID_1307528934" MODIFIED="1692491362173">
+<richcontent TYPE="NODE"><html>
+  <head/>
+  <body>
+    <p>
+      passende ID hierf&#252;r vergeben: <font face="Monospaced" color="#1f726f">afterGATE</font>
+    </p>
+  </body>
+</html></richcontent>
+<icon BUILTIN="button_ok"/>
 </node>
 <node CREATED="1692485443450" ID="ID_577582748" MODIFIED="1692485453069" TEXT="damit wird &#xfc;berpr&#xfc;fbar, wenn das Gate &quot;feuert&quot;"/>
 </node>