diff --git a/thread-pool/etc/thread-pool.png b/thread-pool/etc/thread-pool.png
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diff --git a/thread-pool/etc/thread-pool.ucls b/thread-pool/etc/thread-pool.ucls
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+++ b/thread-pool/etc/thread-pool.ucls
@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<class-diagram version="1.1.8" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true" 
+  realizations="true" associations="true" dependencies="false" nesting-relationships="true">  
+  <class id="1" language="java" name="com.iluwatar.Task" project="thread-pool" 
+    file="/thread-pool/src/main/java/com/iluwatar/Task.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="343" y="579"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="2" language="java" name="com.iluwatar.Worker" project="thread-pool" 
+    file="/thread-pool/src/main/java/com/iluwatar/Worker.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="344" y="389"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="3" language="java" name="com.iluwatar.CoffeeMakingTask" project="thread-pool" 
+    file="/thread-pool/src/main/java/com/iluwatar/CoffeeMakingTask.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="124" width="156" x="194" y="717"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="4" language="java" name="com.iluwatar.PotatoPeelingTask" project="thread-pool" 
+    file="/thread-pool/src/main/java/com/iluwatar/PotatoPeelingTask.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="124" width="169" x="390" y="717"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <association id="5">    
+    <end type="SOURCE" refId="2" navigable="false">      
+      <attribute id="6" name="task"/>      
+      <multiplicity id="7" minimum="0" maximum="1"/>    
+    </end>    
+    <end type="TARGET" refId="1" navigable="true"/>    
+    <display labels="true" multiplicity="true"/>  
+  </association>  
+  <generalization id="8">    
+    <end type="SOURCE" refId="4"/>    
+    <end type="TARGET" refId="1"/>  
+  </generalization>  
+  <generalization id="9">    
+    <end type="SOURCE" refId="3"/>    
+    <end type="TARGET" refId="1"/>  
+  </generalization>  
+  <classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+    sort-features="false" accessors="true" visibility="true">    
+    <attributes public="true" package="true" protected="true" private="true" static="true"/>    
+    <operations public="true" package="true" protected="true" private="true" static="true"/>  
+  </classifier-display>  
+  <association-display labels="true" multiplicity="true"/>
+</class-diagram>
\ No newline at end of file