diff --git a/patterns/pom.xml b/patterns/pom.xml
index bc1f5173e2..3c3bb6d5ea 100644
--- a/patterns/pom.xml
+++ b/patterns/pom.xml
@@ -17,6 +17,7 @@
         <module>front-controller</module>
         <module>intercepting-filter</module>
         <module>design-patterns</module>
+        <module>solid</module>
     </modules>
 
     <dependencyManagement>
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/d/Keyboard.java b/patterns/principles/solid/src/main/java/com/baeldung/d/Keyboard.java
deleted file mode 100644
index acb50cedb4..0000000000
--- a/patterns/principles/solid/src/main/java/com/baeldung/d/Keyboard.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.baeldung.d;
-
-public class Keyboard {
-}
diff --git a/patterns/principles/solid/pom.xml b/patterns/solid/pom.xml
similarity index 54%
rename from patterns/principles/solid/pom.xml
rename to patterns/solid/pom.xml
index 5d308f5120..2837504197 100644
--- a/patterns/principles/solid/pom.xml
+++ b/patterns/solid/pom.xml
@@ -4,17 +4,14 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung</groupId>
-    <artifactId>solid/artifactId>
+    <artifactId>solid</artifactId>
     <version>1.0-SNAPSHOT</version>
 
-    <dependencies>
-        <!-- https://mvnrepository.com/artifact/junit/junit -->
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.12</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
+ <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>patterns</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>..</relativePath>
+    </parent>
 
 </project>
diff --git a/patterns/solid/src/main/java/com/baeldung/d/Keyboard.java b/patterns/solid/src/main/java/com/baeldung/d/Keyboard.java
new file mode 100644
index 0000000000..cc6fc47d65
--- /dev/null
+++ b/patterns/solid/src/main/java/com/baeldung/d/Keyboard.java
@@ -0,0 +1,4 @@
+package com.baeldung.d;
+
+public interface Keyboard {
+}
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/d/Monitor.java b/patterns/solid/src/main/java/com/baeldung/d/Monitor.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/d/Monitor.java
rename to patterns/solid/src/main/java/com/baeldung/d/Monitor.java
diff --git a/patterns/solid/src/main/java/com/baeldung/d/StandardKeyboard.java b/patterns/solid/src/main/java/com/baeldung/d/StandardKeyboard.java
new file mode 100644
index 0000000000..cb0e229943
--- /dev/null
+++ b/patterns/solid/src/main/java/com/baeldung/d/StandardKeyboard.java
@@ -0,0 +1,5 @@
+package com.baeldung.d;
+
+public class StandardKeyboard implements Keyboard {
+
+}
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/d/Windows98Machine.java b/patterns/solid/src/main/java/com/baeldung/d/Windows98Machine.java
similarity index 66%
rename from patterns/principles/solid/src/main/java/com/baeldung/d/Windows98Machine.java
rename to patterns/solid/src/main/java/com/baeldung/d/Windows98Machine.java
index a9f130aedb..4d6ead9aa2 100644
--- a/patterns/principles/solid/src/main/java/com/baeldung/d/Windows98Machine.java
+++ b/patterns/solid/src/main/java/com/baeldung/d/Windows98Machine.java
@@ -2,13 +2,13 @@ package com.baeldung.d;
 
 public class Windows98Machine {
 
-  private final Keyboard keyboard;
+  private final StandardKeyboard keyboard;
   private final Monitor monitor;
 
   public Windows98Machine() {
 
     monitor = new Monitor();
-    keyboard = new Keyboard();
+    keyboard = new StandardKeyboard();
 
   }
 
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/d/Windows98MachineDI.java b/patterns/solid/src/main/java/com/baeldung/d/Windows98MachineDI.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/d/Windows98MachineDI.java
rename to patterns/solid/src/main/java/com/baeldung/d/Windows98MachineDI.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/i/BearCarer.java b/patterns/solid/src/main/java/com/baeldung/i/BearCarer.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/i/BearCarer.java
rename to patterns/solid/src/main/java/com/baeldung/i/BearCarer.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/i/BearCleaner.java b/patterns/solid/src/main/java/com/baeldung/i/BearCleaner.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/i/BearCleaner.java
rename to patterns/solid/src/main/java/com/baeldung/i/BearCleaner.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/i/BearFeeder.java b/patterns/solid/src/main/java/com/baeldung/i/BearFeeder.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/i/BearFeeder.java
rename to patterns/solid/src/main/java/com/baeldung/i/BearFeeder.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/i/BearKeeper.java b/patterns/solid/src/main/java/com/baeldung/i/BearKeeper.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/i/BearKeeper.java
rename to patterns/solid/src/main/java/com/baeldung/i/BearKeeper.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/i/BearPetter.java b/patterns/solid/src/main/java/com/baeldung/i/BearPetter.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/i/BearPetter.java
rename to patterns/solid/src/main/java/com/baeldung/i/BearPetter.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/i/CrazyPerson.java b/patterns/solid/src/main/java/com/baeldung/i/CrazyPerson.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/i/CrazyPerson.java
rename to patterns/solid/src/main/java/com/baeldung/i/CrazyPerson.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/l/Car.java b/patterns/solid/src/main/java/com/baeldung/l/Car.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/l/Car.java
rename to patterns/solid/src/main/java/com/baeldung/l/Car.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/l/ElectricCar.java b/patterns/solid/src/main/java/com/baeldung/l/ElectricCar.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/l/ElectricCar.java
rename to patterns/solid/src/main/java/com/baeldung/l/ElectricCar.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/l/Engine.java b/patterns/solid/src/main/java/com/baeldung/l/Engine.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/l/Engine.java
rename to patterns/solid/src/main/java/com/baeldung/l/Engine.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/l/MotorCar.java b/patterns/solid/src/main/java/com/baeldung/l/MotorCar.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/l/MotorCar.java
rename to patterns/solid/src/main/java/com/baeldung/l/MotorCar.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/o/Guitar.java b/patterns/solid/src/main/java/com/baeldung/o/Guitar.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/o/Guitar.java
rename to patterns/solid/src/main/java/com/baeldung/o/Guitar.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/o/SuperCoolGuitarWithFlames.java b/patterns/solid/src/main/java/com/baeldung/o/SuperCoolGuitarWithFlames.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/o/SuperCoolGuitarWithFlames.java
rename to patterns/solid/src/main/java/com/baeldung/o/SuperCoolGuitarWithFlames.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/s/BadBook.java b/patterns/solid/src/main/java/com/baeldung/s/BadBook.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/s/BadBook.java
rename to patterns/solid/src/main/java/com/baeldung/s/BadBook.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/s/BookPrinter.java b/patterns/solid/src/main/java/com/baeldung/s/BookPrinter.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/s/BookPrinter.java
rename to patterns/solid/src/main/java/com/baeldung/s/BookPrinter.java
diff --git a/patterns/principles/solid/src/main/java/com/baeldung/s/GoodBook.java b/patterns/solid/src/main/java/com/baeldung/s/GoodBook.java
similarity index 100%
rename from patterns/principles/solid/src/main/java/com/baeldung/s/GoodBook.java
rename to patterns/solid/src/main/java/com/baeldung/s/GoodBook.java