diff --git a/.classpath b/.classpath
index af1430b..98370b4 100644
--- a/.classpath
+++ b/.classpath
@@ -12,11 +12,7 @@
 			<attribute name="maven.pomderived" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
-		<attributes>
-			<attribute name="maven.pomderived" value="true"/>
-		</attributes>
-	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/jdk1.8.0_91"/>
 	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>
diff --git a/.travis.yml b/.travis.yml
index dff5f3a..9bcf999 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1 +1,3 @@
 language: java
+jdk:
+  - oraclejdk8
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ae53c61
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+jax-ftd-day-4-java-assignment-2
+===
+
+[![Build Status](https://travis-ci.org/AldenSharp/jax-ftd-day-4-java-assignment-2.svg?branch=AldenSharp)](https://travis-ci.org/AldenSharp/jax-ftd-day-4-java-assignment-2)
diff --git a/src/main/java/com/cooksys/butterpillar/model/Butterpillar.java b/src/main/java/com/cooksys/butterpillar/model/Butterpillar.java
index 1060573..8a0f7b0 100644
--- a/src/main/java/com/cooksys/butterpillar/model/Butterpillar.java
+++ b/src/main/java/com/cooksys/butterpillar/model/Butterpillar.java
@@ -1,34 +1,35 @@
 package com.cooksys.butterpillar.model;
 
 public class Butterpillar {
-	
-	// any instance fields should be private
+
+	private double length;
+	private double leavesEaten;
 
 	public double getLength() {
-		return 0; // TODO: to be implemented
+		return length;
 	}
 
 	public void setLength(double length) {
-		// TODO: to be implemented
+		this.length = length;
 	}
 
 	public double getLeavesEaten() {
-		return 0; // TODO: to be implemented
+		return leavesEaten;
 	}
 
 	public void setLeavesEaten(double leavesEaten) {
-		// TODO: to be implemented
+		this.leavesEaten = leavesEaten;
 	}
-	
+
 	public boolean equals(Butterpillar b) {
-		return false; // TODO: to be implemented
+		return b.getLength() == length && b.getLeavesEaten() == leavesEaten;
 	}
-	
+
 	@Override
 	public String toString() {
-		return null; // TODO: to be implemented
+		return "Butterpillar: {length=" + length + "; leavesEaten=" + leavesEaten + "}";
 	}
-	
+
 	@Override
 	public boolean equals(Object o) {
 		if (o instanceof Butterpillar) {
@@ -37,7 +38,5 @@ public boolean equals(Object o) {
 			return false;
 		}
 	}
-	
-	
 
 }
diff --git a/src/main/java/com/cooksys/butterpillar/model/Catterfly.java b/src/main/java/com/cooksys/butterpillar/model/Catterfly.java
index 81ff09a..02845a0 100644
--- a/src/main/java/com/cooksys/butterpillar/model/Catterfly.java
+++ b/src/main/java/com/cooksys/butterpillar/model/Catterfly.java
@@ -1,34 +1,35 @@
 package com.cooksys.butterpillar.model;
 
 public class Catterfly {
-	
-	// any instance fields should be private
+
+	private double wingspan;
+	private double weight;
 
 	public double getWingspan() {
-		return 0; // to be implemented
+		return wingspan;
 	}
 
 	public void setWingspan(double wingspan) {
-		// to be implemented
+		this.wingspan = wingspan;
 	}
 
 	public double getWeight() {
-		return 0; // TODO: to be implemented
+		return weight;
 	}
 
 	public void setWeight(double weight) {
-		// TODO: to be implemented
+		this.weight = weight;
 	}
-	
+
 	public boolean equals(Catterfly c) {
-		return false; // TODO: to be implemented
+		return c.getWingspan() == wingspan && c.getWeight() == weight;
 	}
-	
+
 	@Override
 	public String toString() {
-		return null; // TODO: to be implemented
+		return "Catterfly: {wingspan=" + wingspan + "; weight=" + weight + "}";
 	}
-	
+
 	@Override
 	public boolean equals(Object o) {
 		if (o instanceof Catterfly) {
diff --git a/src/main/java/com/cooksys/butterpillar/model/GrowthModel.java b/src/main/java/com/cooksys/butterpillar/model/GrowthModel.java
index 3f034fd..e62e214 100644
--- a/src/main/java/com/cooksys/butterpillar/model/GrowthModel.java
+++ b/src/main/java/com/cooksys/butterpillar/model/GrowthModel.java
@@ -2,41 +2,49 @@
 
 public class GrowthModel {
 
-	// any instance fields should be private
+	private double lengthToWingspan;
+	private double leavesEatenToWeight;
 
 	public double getLengthToWingspan() {
-		return 0; // to be implemented
+		return lengthToWingspan;
 	}
 
 	public void setLengthToWingspan(double lengthToWingspan) {
-		// to be implemented
+		this.lengthToWingspan = lengthToWingspan;
 	}
 
 	public double getLeavesEatenToWeight() {
-		return 0; // to be implemented
+		return leavesEatenToWeight;
 	}
 
 	public void setLeavesEatenToWeight(double leavesEatenToWeight) {
-		// to be implemented
+		this.leavesEatenToWeight = leavesEatenToWeight;
 	}
 
 	public Catterfly butterpillarToCatterfly(Butterpillar butterpillar) {
-		return null; // to be implemented
+		Catterfly catterfly = new Catterfly();
+		catterfly.setWingspan(butterpillar.getLength() * lengthToWingspan);
+		catterfly.setWeight(butterpillar.getLeavesEaten() * leavesEatenToWeight);
+		return catterfly; // to be implemented
 	}
 
 	public Butterpillar catterflyToButterpillar(Catterfly catterfly) {
-		return null; // to be implemented
+		Butterpillar butterpillar = new Butterpillar();
+		butterpillar.setLength(catterfly.getWingspan() / lengthToWingspan);
+		butterpillar.setLeavesEaten(catterfly.getWeight() / leavesEatenToWeight);
+		return butterpillar; // to be implemented
 	}
-	
+
 	public boolean equals(GrowthModel g) {
-		return false; // TODO: to be implemented
+		return g.getLengthToWingspan() == lengthToWingspan && g.getLeavesEatenToWeight() == leavesEatenToWeight;
 	}
-	
+
 	@Override
 	public String toString() {
-		return null; // TODO: to be implemented
+		return "GrowthModel: {lengthToWingspan=" + lengthToWingspan + "; leavesEatenToWeight=" + leavesEatenToWeight
+				+ "}";
 	}
-	
+
 	@Override
 	public boolean equals(Object o) {
 		if (o instanceof GrowthModel) {