diff --git a/singleton/README.md b/singleton/README.md
index 4032ffaed..0a81ba0fc 100644
--- a/singleton/README.md
+++ b/singleton/README.md
@@ -15,7 +15,32 @@ tags:
 Ensure a class only has one instance, and provide a global point of
 access to it.
 
-![alt text](./etc/singleton_1.png "Singleton")
+
+## Explanation
+Real world example
+> There can only be one ivory tower where the wizards study their magic. The same enchanted ivory tower is always used by the wizards. Ivory tower here is singleton.
+
+In plain words
+> Ensures that only one object of a particular class is ever created.
+
+Wikipedia says
+> In software engineering, the singleton pattern is a software design pattern that restricts the instantiation of a class to one object. This is useful when exactly one object is needed to coordinate actions across the system.
+
+**Programmatic Example**
+
+Joshua Bloch, Effective Java 2nd Edition p.18
+> A single-element enum type is the best way to implement a singleton
+```
+public enum EnumIvoryTower {
+  INSTANCE;
+}
+```
+Then in order to use
+```
+EnumIvoryTower enumIvoryTower1 = EnumIvoryTower.INSTANCE;
+EnumIvoryTower enumIvoryTower2 = EnumIvoryTower.INSTANCE;
+assertEquals(enumIvoryTower1, enumIvoryTower2); // true
+```
 
 ## Applicability
 Use the Singleton pattern when
@@ -40,7 +65,7 @@ Use the Singleton pattern when
 
 * Violates Single Responsibility Principle (SRP) by controlling their own creation and lifecycle.
 * Encourages using a global shared instance which prevents an object and resources used by this object from being deallocated.     
-* Creates tightly coupled code that is difficult to test.
+* Creates tightly coupled code. The clients of the Singleton become difficult to test.
 * Makes it almost impossible to subclass a Singleton.
 
 ## Credits
diff --git a/singleton/etc/singleton.png b/singleton/etc/singleton.png
deleted file mode 100644
index 0bf0c9b28..000000000
Binary files a/singleton/etc/singleton.png and /dev/null differ
diff --git a/singleton/etc/singleton.ucls b/singleton/etc/singleton.ucls
deleted file mode 100644
index 40c2ebd19..000000000
--- a/singleton/etc/singleton.ucls
+++ /dev/null
@@ -1,104 +0,0 @@
-<?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.singleton.InitializingOnDemandHolderIdiom.HelperHolder" 
-    project="singleton" file="/singleton/src/main/java/com/iluwatar/singleton/InitializingOnDemandHolderIdiom.java" 
-    binary="false" corner="BOTTOM_RIGHT">    
-    <position height="88" width="133" x="328" y="457"/>    
-    <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.singleton.IvoryTower" project="singleton" 
-    file="/singleton/src/main/java/com/iluwatar/singleton/IvoryTower.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="106" width="164" x="114" y="275"/>    
-    <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.singleton.InitializingOnDemandHolderIdiom" project="singleton" 
-    file="/singleton/src/main/java/com/iluwatar/singleton/InitializingOnDemandHolderIdiom.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="142" width="295" x="328" y="275"/>    
-    <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>  
-  <enumeration id="4" language="java" name="com.iluwatar.singleton.EnumIvoryTower" project="singleton" 
-    file="/singleton/src/main/java/com/iluwatar/singleton/EnumIvoryTower.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="124" width="190" x="663" y="275"/>    
-    <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>  
-  </enumeration>  
-  <class id="5" language="java" name="com.iluwatar.singleton.ThreadSafeLazyLoadedIvoryTower" project="singleton" 
-    file="/singleton/src/main/java/com/iluwatar/singleton/ThreadSafeLazyLoadedIvoryTower.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="106" width="299" x="893" y="275"/>    
-    <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="6" language="java" name="com.iluwatar.singleton.ThreadSafeDoubleCheckLocking" project="singleton" 
-    file="/singleton/src/main/java/com/iluwatar/singleton/ThreadSafeDoubleCheckLocking.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="106" width="292" x="1242" y="275"/>    
-    <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="7">    
-    <end type="SOURCE" refId="2" navigable="false">      
-      <attribute id="8" name="instance"/>      
-      <multiplicity id="9" minimum="0" maximum="1"/>    
-    </end>    
-    <end type="TARGET" refId="2" navigable="true"/>    
-    <display labels="true" multiplicity="true"/>  
-  </association>  
-  <association id="10">    
-    <end type="SOURCE" refId="6" navigable="false">      
-      <attribute id="11" name="INSTANCE"/>      
-      <multiplicity id="12" minimum="0" maximum="1"/>    
-    </end>    
-    <end type="TARGET" refId="6" navigable="true"/>    
-    <display labels="true" multiplicity="true"/>  
-  </association>  
-  <association id="13">    
-    <end type="SOURCE" refId="1" navigable="false">      
-      <attribute id="14" name="INSTANCE"/>      
-      <multiplicity id="15" minimum="0" maximum="1"/>    
-    </end>    
-    <end type="TARGET" refId="3" navigable="true"/>    
-    <display labels="true" multiplicity="true"/>  
-  </association>  
-  <nesting id="16">    
-    <end type="SOURCE" refId="3"/>    
-    <end type="TARGET" refId="1"/>  
-  </nesting>  
-  <association id="17">    
-    <end type="SOURCE" refId="5" navigable="false">      
-      <attribute id="18" name="instance"/>      
-      <multiplicity id="19" minimum="0" maximum="1"/>    
-    </end>    
-    <end type="TARGET" refId="5" navigable="true"/>    
-    <display labels="true" multiplicity="true"/>  
-  </association>  
-  <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
diff --git a/singleton/etc/singleton.urm.puml b/singleton/etc/singleton.urm.puml
deleted file mode 100644
index f61377e17..000000000
--- a/singleton/etc/singleton.urm.puml
+++ /dev/null
@@ -1,43 +0,0 @@
-@startuml
-package com.iluwatar.singleton {
-  class App {
-    - LOGGER : Logger {static}
-    + App()
-    + main(args : String[]) {static}
-  }
-  enum EnumIvoryTower {
-    + INSTANCE {static}
-    + toString() : String
-    + valueOf(name : String) : EnumIvoryTower {static}
-    + values() : EnumIvoryTower[] {static}
-  }
-  class InitializingOnDemandHolderIdiom {
-    - InitializingOnDemandHolderIdiom()
-    + getInstance() : InitializingOnDemandHolderIdiom {static}
-  }
-  -class HelperHolder {
-    - INSTANCE : InitializingOnDemandHolderIdiom {static}
-    - HelperHolder()
-  }
-  class IvoryTower {
-    - INSTANCE : IvoryTower {static}
-    - IvoryTower()
-    + getInstance() : IvoryTower {static}
-  }
-  class ThreadSafeDoubleCheckLocking {
-    - instance : ThreadSafeDoubleCheckLocking {static}
-    - ThreadSafeDoubleCheckLocking()
-    + getInstance() : ThreadSafeDoubleCheckLocking {static}
-  }
-  class ThreadSafeLazyLoadedIvoryTower {
-    - instance : ThreadSafeLazyLoadedIvoryTower {static}
-    - ThreadSafeLazyLoadedIvoryTower()
-    + getInstance() : ThreadSafeLazyLoadedIvoryTower {static}
-  }
-}
-IvoryTower -->  "-INSTANCE" IvoryTower
-ThreadSafeDoubleCheckLocking -->  "-instance" ThreadSafeDoubleCheckLocking
-ThreadSafeLazyLoadedIvoryTower -->  "-instance" ThreadSafeLazyLoadedIvoryTower
-HelperHolder ..+ InitializingOnDemandHolderIdiom
-HelperHolder -->  "-INSTANCE" InitializingOnDemandHolderIdiom
-@enduml
\ No newline at end of file
diff --git a/singleton/etc/singleton_1.png b/singleton/etc/singleton_1.png
deleted file mode 100644
index 58dc440a9..000000000
Binary files a/singleton/etc/singleton_1.png and /dev/null differ