diff --git a/src/lib/several-builder.hpp b/src/lib/several-builder.hpp
index 5ba131650..fc546636f 100644
--- a/src/lib/several-builder.hpp
+++ b/src/lib/several-builder.hpp
@@ -156,6 +156,8 @@ namespace lib {
         using Fac::Fac; // pass-through ctor
         
         const bool isDisposable{false};    ///< memory must be explicitly deallocated
+         
+        bool canExpand(size_t){ return false; }
         
         Bucket*
         realloc (Bucket* data, size_t demand)
@@ -217,12 +219,12 @@ namespace lib {
     using lib::meta::is_Subclass;
     
     template<class I, class E>
-    struct MemStrategy
+    struct HandlingStrategy
       {
         bool disposable :1 ;
         bool wild_move :1 ;
         
-        MemStrategy (bool unmanaged)
+        HandlingStrategy (bool unmanaged)
           : disposable{unmanaged or (is_trivially_destructible_v<E> and
                                      is_trivially_destructible_v<I>)}
           , wild_move{false}
@@ -257,7 +259,7 @@ namespace lib {
         bool
         canDestroy()
           {
-            return disposable
+            return (disposable and is_trivially_destructible_v<TY>)
                 or (is_trivially_destructible_v<TY> and is_trivially_destructible_v<I>)
                 or (has_virtual_destructor_v<I> and is_Subclass<TY,I>())
                 or (is_same_v<TY,E> and is_Subclass<E,I>());
@@ -267,8 +269,7 @@ namespace lib {
         bool
         canDynGrow()
           {
-            return is_same_v<TY,E>
-                or (is_trivially_move_constructible_v<TY> and wild_move);
+            return is_same_v<TY,E> or wild_move;
           }
         
         auto
@@ -299,7 +300,7 @@ namespace lib {
     {
       using Coll = Several<I>;
       
-      MemStrategy<I,E> memStrategy_{POL::isDisposable};
+      HandlingStrategy<I,E> handling_{POL::isDisposable};
       
     public:
       SeveralBuilder() = default;
@@ -397,31 +398,34 @@ namespace lib {
       void
       emplaceElm (ARGS&& ...args)
         {
-          if (not memStrategy_.template canDestroy<TY>())
+          if (not handling_.template canDestroy<TY>())
             throw err::Invalid{_Fmt{"Unable to handle destructor for element type %s"}
                                    % util::typeStr<TY>()};
           
           // mark acceptance of trivially movable arbitrary data types
-          if (not memStrategy_.template markWildMovePossibility<TY>())
+          if (not handling_.template markWildMovePossibility<TY>())
             throw err::Invalid{_Fmt{"Unable to trivially move element type %s, "
                                     "while other elements in this container are trivially movable."}
                                    % util::typeStr<TY>()};
           
-          ////////////////////////////////////OOO check here for suitable spread
+          // ensure sufficient element capacity or the ability to adapt element spread
+          if (Coll::spread() < sizeof(TY) and not (Coll::empty() or handling_.wild_move))
+            throw err::Invalid{_Fmt{"Unable to place element of type %s (size=%d)"
+                                    "into container for element size %d."}
+                                   % util::typeStr<TY>() % sizeof(TY) % Coll::spread()};
           
-          ////////////////////////////////////OOO check here for sufficient space
+          // ensure sufficient storage or verify the ability to re-allocate
+          if (not (Coll::hasReserve(sizeof(TY))
+                   or POL::canExpand(sizeof(TY))
+                   or handling_.template canDynGrow<TY>()))
+            throw err::Invalid{_Fmt{"Unable to accommodate further element of type %s "}
+                                   % util::typeStr<TY>()};
           
           size_t elmSiz = sizeof(TY);
           size_t newCnt = Coll::size()+1;
-          adjustStorage (newCnt, requiredSpread(elmSiz));
+          adjustStorage (newCnt, max (elmSiz, Coll::spread()));
           Coll::data_->cnt = newCnt;
-          POL::template createAt<TY> (Coll::data_, Coll::size(), forward<ARGS> (args)...);
-        }
-      
-      size_t
-      requiredSpread (size_t elmSiz)
-        {
-          return util::max (Coll::spread(), elmSiz);
+          POL::template createAt<TY> (Coll::data_, newCnt-1, forward<ARGS> (args)...);
         }
     };
   
diff --git a/src/lib/several.hpp b/src/lib/several.hpp
index 380e2fd21..e7f600652 100644
--- a/src/lib/several.hpp
+++ b/src/lib/several.hpp
@@ -188,6 +188,15 @@ namespace lib {
           return data_? data_->spread : sizeof(I);
         }
       
+      bool
+      hasReserve (size_t extraSize)  const
+        {
+          if (extraSize > spread())
+            extraSize += (extraSize - spread())*size();
+          return data_
+             and data_->buffSiz >= size()*spread() + extraSize;
+        }
+      
     private:
       void
       discardData()
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index e5e5af37f..f475a5b26 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -82444,6 +82444,9 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <arrowlink COLOR="#ec1c03" DESTINATION="ID_584325941" ENDARROW="Default" ENDINCLINATION="167;18;" ID="Arrow_ID_1090340504" STARTARROW="None" STARTINCLINATION="178;0;"/>
 <arrowlink COLOR="#ec1c03" DESTINATION="ID_1523639170" ENDARROW="Default" ENDINCLINATION="167;18;" ID="Arrow_ID_15683997" STARTARROW="None" STARTINCLINATION="178;0;"/>
 <icon BUILTIN="flag-pink"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717858632242" HGAP="33" ID="ID_230351736" MODIFIED="1717858646313" TEXT="korrekte Methode f&#xfc;r Verschiebung w&#xe4;hlen" VSHIFT="23">
+<icon BUILTIN="flag-yellow"/>
+</node>
 </node>
 </node>
 <node BACKGROUND_COLOR="#f0d5c5" COLOR="#990033" CREATED="1717723649872" ID="ID_1412900866" MODIFIED="1717723682406" TEXT="Deleter einbinden?">
@@ -82575,6 +82578,33 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 </node>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717857952662" ID="ID_151747312" MODIFIED="1717858054385" TEXT="adjustStorage">
+<icon BUILTIN="flag-yellow"/>
+<node CREATED="1717858103112" ID="ID_665641447" MODIFIED="1717858118107" TEXT="Einstieg f&#xfc;r Storage-Anpassungen">
+<node CREATED="1717858205276" ID="ID_1237762599" MODIFIED="1717858215918" TEXT="wird bei Bedarf aufgerufen"/>
+<node CREATED="1717858386974" ID="ID_319057950" MODIFIED="1717858400465" TEXT="bekommt nur noch die geforderte Zielkapazit&#xe4;t"/>
+<node CREATED="1717858221198" ID="ID_13569379" MODIFIED="1717858362700" TEXT="keine Pr&#xfc;fung der Handhabbarkeit mehr">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      die grunds&#228;tzliche M&#246;glichkeit der Anpassung ist bereits vorher sichergestellt, denn der veranlassende API-call w&#228;re sonst schon per Exception abgebrochen worden
+    </p>
+  </body>
+</html>
+</richcontent>
+<icon BUILTIN="yes"/>
+</node>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717857964116" ID="ID_1398927698" MODIFIED="1717858080950" TEXT="spread-Erweiterung korrekt handhaben">
+<linktarget COLOR="#494890" DESTINATION="ID_1398927698" ENDARROW="Default" ENDINCLINATION="-414;28;" ID="Arrow_ID_834912184" SOURCE="ID_1036114720" STARTARROW="None" STARTINCLINATION="389;36;"/>
+<icon BUILTIN="yes"/>
+<node CREATED="1717858131668" ID="ID_1076555932" MODIFIED="1717858160950" TEXT="mu&#xdf; vorher f&#xfc;r den notwendigen Platz sorgen"/>
+<node CREATED="1717858161497" ID="ID_114984038" MODIFIED="1717858172964" TEXT="kann danach die bestehenden Elemente verschieben"/>
+</node>
+</node>
 <node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1716914864769" ID="ID_966642586" MODIFIED="1716914906125" TEXT="Builder-Operationen">
 <icon BUILTIN="pencil"/>
 <node COLOR="#338800" CREATED="1717634297656" ID="ID_330412196" MODIFIED="1717688579115" TEXT="Move-builder und Container per Slice ausgeben">
@@ -82673,7 +82703,7 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node CREATED="1717796446579" ID="ID_229190267" MODIFIED="1717796449135" TEXT="unmanaged"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717805473588" ID="ID_1414521671" MODIFIED="1717806898610" TEXT="Logik f&#xfc;r Element-Konstruktion">
+<node COLOR="#435e98" CREATED="1717805473588" ID="ID_1414521671" MODIFIED="1717860659461" TEXT="Logik f&#xfc;r Element-Konstruktion">
 <icon BUILTIN="info"/>
 <node COLOR="#338800" CREATED="1717805494018" ID="ID_1249779598" MODIFIED="1717810959882" TEXT="Element-Typ ist akzepabel">
 <icon BUILTIN="button_ok"/>
@@ -82707,15 +82737,28 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 <node CREATED="1717809142579" ID="ID_528651025" MODIFIED="1717809223883" TEXT="Vorsicht: auch Ausschlu&#xdf; pr&#xfc;fen falls wild-move-Flag gesetzt"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717806413974" ID="ID_174948167" MODIFIED="1717810968198" TEXT="spread">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1717806413974" ID="ID_174948167" MODIFIED="1717859049170" TEXT="spread">
+<icon BUILTIN="button_ok"/>
 <node CREATED="1717806419241" ID="ID_756384981" MODIFIED="1717806423193" TEXT="ist ausreichend"/>
 <node CREATED="1717806423863" ID="ID_1855708298" MODIFIED="1717806461147" TEXT="&#x2228; container leer &#x27f9; Spread redefinieren"/>
 <node CREATED="1717806462116" ID="ID_88555748" MODIFIED="1717806508162" TEXT="&#x2228; Fall-5 &#x27f9; Spread rejustieren"/>
+<node COLOR="#338800" CREATED="1717857894087" ID="ID_1190583889" MODIFIED="1717859039840" TEXT="hier wird nur die M&#xf6;glichkeit gepr&#xfc;ft">
+<icon BUILTIN="yes"/>
+<node CREATED="1717857941328" ID="ID_1036114720" MODIFIED="1717858080950" TEXT="adjustStorage macht die Arbeit">
+<arrowlink COLOR="#494890" DESTINATION="ID_1398927698" ENDARROW="Default" ENDINCLINATION="-414;28;" ID="Arrow_ID_834912184" STARTARROW="None" STARTINCLINATION="389;36;"/>
+</node>
+</node>
+</node>
+<node COLOR="#338800" CREATED="1717806648902" ID="ID_31178019" MODIFIED="1717860648985" TEXT="storage">
+<icon BUILTIN="button_ok"/>
+<node CREATED="1717806656110" ID="ID_620814998" MODIFIED="1717806658963" TEXT="ist ausreichend">
+<node COLOR="#338800" CREATED="1717860614915" ID="ID_1797884883" MODIFIED="1717860632353" TEXT="Pr&#xfc;froutine in Basis-Container">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1717860636528" ID="ID_1467740898" MODIFIED="1717860647333" TEXT="auch eventuelle Spread-Erweiterung mit einrechnen">
+<icon BUILTIN="button_ok"/>
+</node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717806648902" ID="ID_31178019" MODIFIED="1717810970218" TEXT="storage">
-<icon BUILTIN="flag-yellow"/>
-<node CREATED="1717806656110" ID="ID_620814998" MODIFIED="1717806658963" TEXT="ist ausreichend"/>
 <node CREATED="1717806666956" ID="ID_1772310323" MODIFIED="1717806751117" TEXT="&#x2228; Strategy::canDynGrow&lt;TY&gt;">
 <node CREATED="1717806757128" ID="ID_1234267874" MODIFIED="1717806762203" TEXT="TY == E (oder I)"/>
 <node CREATED="1717806781292" ID="ID_1519435147" MODIFIED="1717806785968" TEXT="&#x2228; Fall-5"/>