diff --git a/pom.xml b/pom.xml
index f0effe12..22cffbe3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,19 @@
   <groupId>io.zipcoder</groupId>
   <artifactId>interfaces-1</artifactId>
   <version>0.0.1-SNAPSHOT</version>
-  <packaging>jar</packaging>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+    <packaging>jar</packaging>
 
   <name>interfaces-1</name>
   <url>http://maven.apache.org</url>
diff --git a/src/main/java/io/zipcoder/interfaces/Instructor.java b/src/main/java/io/zipcoder/interfaces/Instructor.java
new file mode 100644
index 00000000..9fb4bb82
--- /dev/null
+++ b/src/main/java/io/zipcoder/interfaces/Instructor.java
@@ -0,0 +1,15 @@
+package io.zipcoder.interfaces;
+
+public class Instructor extends Person implements Teacher {
+
+    public void teach(Learner learner, double numberOfHours) {
+        learner.learn(numberOfHours);
+    }
+
+    public void lecture(Learner[] learners, double numberOfHours) {
+        for (int i = 0; i < learners.length; i++) {
+            Double numOfHoursPerLearner = numberOfHours/ learners.length;
+            learners[i].learn(numOfHoursPerLearner);
+        }
+    }
+}
diff --git a/src/main/java/io/zipcoder/interfaces/Instructors.java b/src/main/java/io/zipcoder/interfaces/Instructors.java
new file mode 100644
index 00000000..18a5fe17
--- /dev/null
+++ b/src/main/java/io/zipcoder/interfaces/Instructors.java
@@ -0,0 +1,17 @@
+package io.zipcoder.interfaces;
+
+public class Instructors extends People<Instructor> {
+
+    static final Instructors INSTANCE;
+
+    private Instructors() {
+    }
+
+    static {
+        INSTANCE = new Instructors();
+    }
+
+    public static Instructors getInstance() {
+        return Instructors.INSTANCE;
+    }
+}
diff --git a/src/main/java/io/zipcoder/interfaces/Learner.java b/src/main/java/io/zipcoder/interfaces/Learner.java
new file mode 100644
index 00000000..e9b5b99c
--- /dev/null
+++ b/src/main/java/io/zipcoder/interfaces/Learner.java
@@ -0,0 +1,8 @@
+package io.zipcoder.interfaces;
+
+public interface Learner {
+
+    public void learn (double numberOfHours);
+
+    public Double getTotalStudyTime ();
+}
diff --git a/src/main/java/io/zipcoder/interfaces/People.java b/src/main/java/io/zipcoder/interfaces/People.java
new file mode 100644
index 00000000..4353accb
--- /dev/null
+++ b/src/main/java/io/zipcoder/interfaces/People.java
@@ -0,0 +1,59 @@
+package io.zipcoder.interfaces;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Spliterator;
+import java.util.function.Consumer;
+
+public class People<E extends Person>implements Iterable<E>{
+
+    List<E> personList;
+
+    public People () {
+        this.personList = new ArrayList<>();
+    }
+
+    public void add (E person) {
+        personList.add(person);
+    }
+
+    public E findById (long id) {
+        for (E person : personList) {
+            if (person.getId() == id) {
+                return person;
+            }
+        }
+        return null;
+    }
+
+    public Boolean containsPerson (E person) {
+        return personList.contains(person);
+    }
+
+    public void removePerson (E person) {
+        personList.remove(person);
+    }
+
+    public void removePerson (long id) {
+        personList.remove(findById(id));
+    }
+
+    public void removeAll () {
+        personList.removeAll(personList);
+    }
+
+    public Integer count () {
+        return personList.size();
+    }
+
+    public Array[] toArray () {
+        return (Array[]) personList.toArray();
+    }
+
+    public Iterator<E> iterator() {
+        return (Iterator<E>) personList.iterator();
+    }
+
+}
diff --git a/src/main/java/io/zipcoder/interfaces/Person.java b/src/main/java/io/zipcoder/interfaces/Person.java
index fc6a3ffe..9d69aa7e 100644
--- a/src/main/java/io/zipcoder/interfaces/Person.java
+++ b/src/main/java/io/zipcoder/interfaces/Person.java
@@ -1,5 +1,30 @@
 package io.zipcoder.interfaces;
 
+import sun.util.resources.ga.LocaleNames_ga;
+
 public class Person {
+    final long id;
+    String name;
+
+    public Person () {
+        this.id = System.nanoTime();
+        this.name = "";
+    }
+
+    public Person (long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
 
+    public long getId() {
+        return id;
+    }
 }
diff --git a/src/main/java/io/zipcoder/interfaces/Student.java b/src/main/java/io/zipcoder/interfaces/Student.java
new file mode 100644
index 00000000..ae7df72b
--- /dev/null
+++ b/src/main/java/io/zipcoder/interfaces/Student.java
@@ -0,0 +1,16 @@
+package io.zipcoder.interfaces;
+
+public class Student extends Person implements Learner{
+
+    double totalStudyTime;
+
+    public void learn(double numberOfHours) {
+        for (int i = 0; i < numberOfHours; i++) {
+            totalStudyTime++;
+        }
+    }
+
+    public Double getTotalStudyTime() {
+        return totalStudyTime;
+    }
+}
diff --git a/src/main/java/io/zipcoder/interfaces/Students.java b/src/main/java/io/zipcoder/interfaces/Students.java
new file mode 100644
index 00000000..530cb3d4
--- /dev/null
+++ b/src/main/java/io/zipcoder/interfaces/Students.java
@@ -0,0 +1,27 @@
+package io.zipcoder.interfaces;
+
+import com.sun.xml.internal.bind.v2.model.core.ID;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+ public class Students extends People<Student> implements Serializable {
+    // Part 7.1
+     static final Students INSTANCE;
+
+     private Students(){
+    }
+
+    static {
+         INSTANCE = new Students();
+    }
+
+    public static Students getInstance() {
+        return Students.INSTANCE;
+    }
+
+     public Student[] getArray () {
+         return super.personList.toArray(new Student[0]);
+    }
+ }
diff --git a/src/main/java/io/zipcoder/interfaces/Teacher.java b/src/main/java/io/zipcoder/interfaces/Teacher.java
new file mode 100644
index 00000000..89270d0f
--- /dev/null
+++ b/src/main/java/io/zipcoder/interfaces/Teacher.java
@@ -0,0 +1,8 @@
+package io.zipcoder.interfaces;
+
+public interface Teacher {
+
+    public void teach (Learner learner, double numberOfHours);
+
+    public void lecture (Learner[] learners, double numberOfHours);
+}
diff --git a/src/main/java/io/zipcoder/interfaces/ZipCodeWilmington.java b/src/main/java/io/zipcoder/interfaces/ZipCodeWilmington.java
new file mode 100644
index 00000000..73745959
--- /dev/null
+++ b/src/main/java/io/zipcoder/interfaces/ZipCodeWilmington.java
@@ -0,0 +1,28 @@
+package io.zipcoder.interfaces;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+public enum ZipCodeWilmington {
+     INSTANCE;
+     final Students students = Students.getInstance();
+     final Instructors instructors = Instructors.getInstance();
+
+    public void hostLecture (Teacher teacher, double numberOfHours) {
+        teacher.lecture(students.personList.toArray(new Learner[0]), numberOfHours);
+    }
+
+    public void hostLecture (long id, double numberOfHours) {
+        Teacher teacher = instructors.findById(id);
+        hostLecture(teacher, numberOfHours);
+    }
+
+    public Map<Student, Double> getStudyMap () {
+        Map<Student, Double> result = new HashMap<>();
+        for (Student student : students) {
+            result.put(student, student.getTotalStudyTime());
+        }
+        return result;
+    }
+}
diff --git a/src/test/java/io/zipcoder/interfaces/TestInstructor.java b/src/test/java/io/zipcoder/interfaces/TestInstructor.java
new file mode 100644
index 00000000..2a9f3329
--- /dev/null
+++ b/src/test/java/io/zipcoder/interfaces/TestInstructor.java
@@ -0,0 +1,49 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestInstructor {
+
+    @Test
+    public void implementationTest () {
+        Instructor instructor = new Instructor();
+
+        Assert.assertTrue(instructor instanceof Teacher);
+    }
+
+    @Test
+    public void inheritanceTest () {
+        Instructor instructor = new Instructor();
+
+        Assert.assertTrue(instructor instanceof Person);
+    }
+
+    @Test
+    public void teachTest () {
+        Instructor instructor = new Instructor();
+        Student student = new Student();
+        double expected = 10;
+
+        instructor.teach(student, 10);
+
+        double actual = student.getTotalStudyTime();
+        Assert.assertEquals(expected, actual, 0);
+    }
+
+    @Test
+    public void lectureTest () {
+        Instructor instructor = new Instructor();
+        Student student = new Student();
+        Student student1 = new Student();
+        Learner[] learners = new Learner[]{student, student1};
+        double expected = 5;
+
+        instructor.lecture(learners, 10);
+        double actual = student.getTotalStudyTime();
+        double actual1 = student1.getTotalStudyTime();
+
+        Assert.assertEquals(expected, actual, 0);
+        Assert.assertEquals(expected, actual1, 0);
+    }
+}
diff --git a/src/test/java/io/zipcoder/interfaces/TestInstructors.java b/src/test/java/io/zipcoder/interfaces/TestInstructors.java
new file mode 100644
index 00000000..2709c10d
--- /dev/null
+++ b/src/test/java/io/zipcoder/interfaces/TestInstructors.java
@@ -0,0 +1,20 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestInstructors {
+
+    @Test
+    public void testingSingleton () {
+        Instructor leon = new Instructor();
+        Instructor dolio = new Instructor();
+        Integer expected = 2;
+
+        Instructors.getInstance().add(leon);
+        Instructors.getInstance().add(dolio);
+        Integer actual = Instructors.getInstance().count();
+
+        Assert.assertEquals(expected, actual);
+    }
+}
diff --git a/src/test/java/io/zipcoder/interfaces/TestPeople.java b/src/test/java/io/zipcoder/interfaces/TestPeople.java
new file mode 100644
index 00000000..64557d19
--- /dev/null
+++ b/src/test/java/io/zipcoder/interfaces/TestPeople.java
@@ -0,0 +1,50 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestPeople {
+
+    @Test
+    public void testAdd () {
+        Person person = new Person();
+        Person person1 = new Person();
+        Integer expected = 2;
+
+        People people = new People();
+        people.add(person);
+        people.add(person1);
+        Integer actual = people.personList.size();
+
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testRemove () {
+        Person person = new Person();
+        Person person1 = new Person();
+        Integer expected = 1;
+
+        People people = new People();
+        people.add(person);
+        people.add(person1);
+        people.removePerson(person);
+        Integer actual = people.personList.size();
+
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testFindById () {
+        Person person = new Person(2, "");
+        Person person1 = new Person(23, "");
+        Person expected = person;
+
+        People people = new People();
+        people.add(person);
+        people.add(person1);
+        Person actual = people.findById(2);
+
+        Assert.assertEquals(expected, actual);
+    }
+}
diff --git a/src/test/java/io/zipcoder/interfaces/TestPerson.java b/src/test/java/io/zipcoder/interfaces/TestPerson.java
index d64cd2f0..1453ff71 100644
--- a/src/test/java/io/zipcoder/interfaces/TestPerson.java
+++ b/src/test/java/io/zipcoder/interfaces/TestPerson.java
@@ -1,5 +1,31 @@
 package io.zipcoder.interfaces;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 public class TestPerson {
 
+    @Test
+    public void constructorTest() {
+    long expectedId = 10;
+    String expectedName = "Calvin";
+
+    Person person = new Person(10, "Calvin");
+    long actualId = person.getId();
+    String actualName = person.getName();
+
+    Assert.assertEquals(expectedId, actualId);
+    Assert.assertEquals(expectedName, actualName);
+    }
+
+    @Test
+    public void setNameTest () {
+        String expected = "Alfred";
+
+        Person person = new Person();
+        person.setName("Alfred");
+        String actual = person.getName();
+
+        Assert.assertEquals(expected, actual);
+    }
 }
diff --git a/src/test/java/io/zipcoder/interfaces/TestStudent.java b/src/test/java/io/zipcoder/interfaces/TestStudent.java
new file mode 100644
index 00000000..d16eaae7
--- /dev/null
+++ b/src/test/java/io/zipcoder/interfaces/TestStudent.java
@@ -0,0 +1,32 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestStudent {
+
+    @Test
+    public void testImplementation () {
+        Student student = new Student();
+
+        Assert.assertTrue(student instanceof Learner);
+    }
+
+    @Test
+    public void testInheritance () {
+        Student student = new Student();
+
+        Assert.assertTrue(student instanceof Person);
+    }
+
+    @Test
+    public void testLearn () {
+        Student student = new Student();
+        double expected = 10;
+
+        student.learn(10);
+        double actual = student.getTotalStudyTime();
+
+        Assert.assertEquals(expected, actual, 0);
+    }
+}
diff --git a/src/test/java/io/zipcoder/interfaces/TestStudents.java b/src/test/java/io/zipcoder/interfaces/TestStudents.java
new file mode 100644
index 00000000..e2ad99ad
--- /dev/null
+++ b/src/test/java/io/zipcoder/interfaces/TestStudents.java
@@ -0,0 +1,20 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestStudents {
+
+    @Test
+    public void testingSingleton () {
+        Student student1 = new Student();
+        Student student2 = new Student();
+        Integer expected = 2;
+
+        Students.getInstance().add(student1);
+        Students.getInstance().add(student2);
+        Integer actual = Students.getInstance().count();
+
+        Assert.assertEquals(expected, actual);
+    }
+}
diff --git a/src/test/java/io/zipcoder/interfaces/TestZipCodeWilmington.java b/src/test/java/io/zipcoder/interfaces/TestZipCodeWilmington.java
new file mode 100644
index 00000000..e83734b7
--- /dev/null
+++ b/src/test/java/io/zipcoder/interfaces/TestZipCodeWilmington.java
@@ -0,0 +1,28 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestZipCodeWilmington {
+
+    @Test
+    public void testHostLecture () {
+        Student eric = new Student();
+        Student cindy = new Student();
+        Student petunya = new Student();
+        Student tom = new Student();
+        Instructor jawn = new Instructor();
+
+        Double exepected = 25.0;
+        Students.getInstance().add(eric);
+        Students.getInstance().add(cindy);
+        Students.getInstance().add(petunya);
+        Students.getInstance().add(tom);
+        Instructors.getInstance().add(jawn);
+
+        ZipCodeWilmington.INSTANCE.hostLecture(jawn.getId(), 100.0);
+        Double actual = ZipCodeWilmington.INSTANCE.getStudyMap().get(eric);
+
+        Assert.assertEquals(exepected, actual);
+    }
+}