diff --git a/src/main/java/net/kemitix/conditional/Action.java b/src/main/java/net/kemitix/conditional/Action.java
new file mode 100644
index 0000000..67508e5
--- /dev/null
+++ b/src/main/java/net/kemitix/conditional/Action.java
@@ -0,0 +1,36 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Paul Campbell
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies
+ * or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+ * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package net.kemitix.conditional;
+
+/**
+ * An action to perform in a clause when a {@link Condition} is met.
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net)
+ */
+@FunctionalInterface
+public interface Action {
+
+    /**
+     * The action to perform.
+     */
+    void perform();
+}
diff --git a/src/main/java/net/kemitix/conditional/Condition.java b/src/main/java/net/kemitix/conditional/Condition.java
index 7129574..f0523bf 100644
--- a/src/main/java/net/kemitix/conditional/Condition.java
+++ b/src/main/java/net/kemitix/conditional/Condition.java
@@ -98,14 +98,14 @@ public interface Condition {
      *
      * @return the Condition
      */
-    Condition then(Runnable response);
+    Condition then(Action response);
 
     /**
      * Perform this response if the {@code Condition} is {@code false}.
      *
      * @param response the response to perform
      */
-    void otherwise(Runnable response);
+    void otherwise(Action response);
 
     /**
      * Create a new {@code Condition} for the clause as a continuation to an existing {@code Condition}.
diff --git a/src/main/java/net/kemitix/conditional/FalseCondition.java b/src/main/java/net/kemitix/conditional/FalseCondition.java
index 165a649..0d8837c 100644
--- a/src/main/java/net/kemitix/conditional/FalseCondition.java
+++ b/src/main/java/net/kemitix/conditional/FalseCondition.java
@@ -41,13 +41,13 @@ final class FalseCondition implements Condition {
     }
 
     @Override
-    public Condition then(final Runnable response) {
+    public Condition then(final Action response) {
         return FALSE;
     }
 
     @Override
-    public void otherwise(final Runnable response) {
-        response.run();
+    public void otherwise(final Action response) {
+        response.perform();
     }
 
 }
diff --git a/src/main/java/net/kemitix/conditional/TrueCondition.java b/src/main/java/net/kemitix/conditional/TrueCondition.java
index d2132d1..ce2fbac 100644
--- a/src/main/java/net/kemitix/conditional/TrueCondition.java
+++ b/src/main/java/net/kemitix/conditional/TrueCondition.java
@@ -41,13 +41,13 @@ final class TrueCondition implements Condition {
     }
 
     @Override
-    public Condition then(final Runnable response) {
-        response.run();
+    public Condition then(final Action response) {
+        response.perform();
         return TRUE;
     }
 
     @Override
-    public void otherwise(final Runnable response) {
+    public void otherwise(final Action response) {
         // do nothing
     }
 
diff --git a/src/test/java/net/kemitix/conditional/ConditionalTest.java b/src/test/java/net/kemitix/conditional/ConditionalTest.java
index 0093cd4..525c534 100644
--- a/src/test/java/net/kemitix/conditional/ConditionalTest.java
+++ b/src/test/java/net/kemitix/conditional/ConditionalTest.java
@@ -10,9 +10,9 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 public class ConditionalTest {
 
-    private Runnable thenResponse;
+    private Action thenResponse;
 
-    private Runnable otherwiseResponse;
+    private Action otherwiseResponse;
 
     private boolean thenFlag;