diff --git a/src/main/java/com/github/curriculeon/Classroom.java b/src/main/java/com/github/curriculeon/Classroom.java
new file mode 100644
index 0000000..87c934b
--- /dev/null
+++ b/src/main/java/com/github/curriculeon/Classroom.java
@@ -0,0 +1,36 @@
+package com.github.curriculeon;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Classroom {
+    private final static Classroom instance = new Classroom();
+    private Students students = Students.getINSTANCE();
+    private  Instructors instructors = Instructors.getINSTANCE();
+
+    public static Classroom getClassroom(){
+        return instance;
+    }
+
+    public void hostLecture(Teacher teacher, Double numbersOfHours){
+        teacher.lecture(students.toArray(), numbersOfHours);
+
+    }
+
+
+    public void hostLecture(Long id, Double numberOfHours){
+        Person person = instructors.findById(id);
+        Instructor instructor = (Instructor)person;
+        instructor.lecture(students.toArray(), numberOfHours);
+    }
+
+    public Map<Student, Double> getStudyMap(){
+        Map<Student, Double> result = new HashMap<>();
+        for (Person studentAsperson : students.toArray()) {
+            Student student = (Student)studentAsperson;
+            Double studyTime = student.getTotalStudyTime();
+        }
+        return result;
+    }
+
+}
diff --git a/src/main/java/com/github/curriculeon/Educator.java b/src/main/java/com/github/curriculeon/Educator.java
new file mode 100644
index 0000000..3653bf6
--- /dev/null
+++ b/src/main/java/com/github/curriculeon/Educator.java
@@ -0,0 +1,30 @@
+package com.github.curriculeon;
+
+public enum Educator implements Teacher {
+
+    LEON,
+    HASEEB;
+
+    private Double timeWorked;
+    private final Instructor instructor;
+
+    Educator(){
+        long id = this.ordinal();
+        String name = this.name();// get instructors name.
+        this.instructor = new Instructor(id, name);
+        Instructors.getINSTANCE().add(instructor);
+    }
+
+    ;
+    @Override
+    public void teach(Learner learner, Double numberOfHours) {
+        instructor.teach(learner, numberOfHours);
+        timeWorked += numberOfHours;
+    }
+
+    @Override
+    public void lecture(Learner[] learners, Double numberOfHours) {
+        instructor.lecture(learners, numberOfHours);
+        timeWorked += numberOfHours;
+    }
+}
diff --git a/src/main/java/com/github/curriculeon/Instructor.java b/src/main/java/com/github/curriculeon/Instructor.java
new file mode 100644
index 0000000..1ba5d27
--- /dev/null
+++ b/src/main/java/com/github/curriculeon/Instructor.java
@@ -0,0 +1,22 @@
+package com.github.curriculeon;
+
+public class Instructor extends Person implements Teacher {
+
+    public Instructor(Long id, String name) {
+        super(id, name);
+    }
+
+    @Override
+    public void teach(Learner learner, Double numberOfHours) {
+        learner.learn(numberOfHours);
+    }
+
+    @Override
+    public void lecture(Learner[] learners, Double numberOfHours) {
+        double numberOfHoursPerLearner = numberOfHours / learners.length;
+        for (int i = 0; i <  learners.length; i++) {
+            Learner learner = learners[i];
+            learner.learn(numberOfHoursPerLearner);
+        }
+    }
+}
diff --git a/src/main/java/com/github/curriculeon/Instructors.java b/src/main/java/com/github/curriculeon/Instructors.java
new file mode 100644
index 0000000..3fbdd14
--- /dev/null
+++ b/src/main/java/com/github/curriculeon/Instructors.java
@@ -0,0 +1,28 @@
+package com.github.curriculeon;
+
+
+import java.util.List;
+
+public class Instructors extends People<Instructor> {
+    private static final Instructors INSTANCE = new Instructors();
+
+
+    public Instructors(){
+        this.add( new Instructor(0l, "Leon"));
+        this.add(new Instructor (1l,"Christel"));
+
+    }
+
+    @Override
+    public Instructor[] toArray() {
+        int arrCount = count();
+        Instructor[] destinationArr = new Instructor[arrCount];
+        List<Instructor> instructorList = personList;
+        return instructorList.toArray(destinationArr);
+    }
+
+
+    public static Instructors getINSTANCE(){
+        return INSTANCE;
+    }
+}
diff --git a/src/main/java/com/github/curriculeon/Learner.java b/src/main/java/com/github/curriculeon/Learner.java
new file mode 100644
index 0000000..ed44af1
--- /dev/null
+++ b/src/main/java/com/github/curriculeon/Learner.java
@@ -0,0 +1,7 @@
+package com.github.curriculeon;
+
+public interface Learner {
+
+    void learn(Double numberOfHours);
+    double getTotalStudyTime();
+}
diff --git a/src/main/java/com/github/curriculeon/People.java b/src/main/java/com/github/curriculeon/People.java
new file mode 100644
index 0000000..e5a47a6
--- /dev/null
+++ b/src/main/java/com/github/curriculeon/People.java
@@ -0,0 +1,66 @@
+package com.github.curriculeon;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+
+abstract class People<somePeople extends Person> implements Iterable{
+    List<somePeople> personList;
+    public People(){
+        new ArrayList<>();
+    }
+
+    public People(List<somePeople> personList){
+        this.personList = personList;
+    }
+    public  void add(somePeople personToAdd){
+        personList.add(personToAdd);
+    }
+
+    public  somePeople findById(Long id) {
+        for (int i = 0; i < personList.size() ; i++) {
+            somePeople person = personList.get(i);
+            if (person.getId() == id){// check if the person exist.
+                return person;
+            }else {
+                continue; // keep looking until id is found
+            }
+        }// for
+        return null;
+    }// findById
+
+
+    public boolean contains(somePeople person){
+        return personList.contains(person); //returns true if the object passed contains person.
+    }
+
+    public void remove(somePeople person) {
+        personList.remove(person);
+    }
+
+    public  void remove(Long id) {
+        for (somePeople person : personList) {
+            if (person.getId() == id) {
+                personList.remove(id);
+            }
+        }
+
+    }
+
+    public void removeAll(){
+        personList.clear();
+    }
+
+
+    public  Integer count(){
+        return personList.size();
+    }
+
+    abstract public somePeople[] toArray();
+
+    @Override
+    public Iterator<somePeople> iterator(){
+        return personList.iterator();
+    }
+}//class
diff --git a/src/main/java/com/github/curriculeon/Person.java b/src/main/java/com/github/curriculeon/Person.java
index 3c8350b..ca08879 100644
--- a/src/main/java/com/github/curriculeon/Person.java
+++ b/src/main/java/com/github/curriculeon/Person.java
@@ -1,5 +1,31 @@
 package com.github.curriculeon;
 
+/*
+ * Created By Emmanuel Orubele
+ *  on 7/21/2020
+ */
+
 public class Person {
+    private final Long id;
+    private String name;
+
+public Person() {
+    this.id = getId();
+}
+    public Person(Long id, String name){
+        this.id = id;
+        this.name = name;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
 
+    public void setName(String name) {
+        this.name = name;
+    }
 }
diff --git a/src/main/java/com/github/curriculeon/Student.java b/src/main/java/com/github/curriculeon/Student.java
new file mode 100644
index 0000000..ed5ccec
--- /dev/null
+++ b/src/main/java/com/github/curriculeon/Student.java
@@ -0,0 +1,20 @@
+package com.github.curriculeon;
+
+public class Student extends Person implements Learner{
+
+    private double totalStudyTime;
+    public Student(Long id, String name) {
+        super(id, name);
+    }
+
+    @Override
+    public void learn(Double numberOfHours) {
+        totalStudyTime += numberOfHours;
+
+    }
+
+    @Override
+    public double getTotalStudyTime() {
+        return totalStudyTime;
+    }
+}
diff --git a/src/main/java/com/github/curriculeon/Students.java b/src/main/java/com/github/curriculeon/Students.java
new file mode 100644
index 0000000..6ab5edc
--- /dev/null
+++ b/src/main/java/com/github/curriculeon/Students.java
@@ -0,0 +1,29 @@
+package com.github.curriculeon;
+
+import java.util.List;
+
+public class Students extends People<Student> {
+    private static final Students INSTANCE = new Students();
+    //private Map<Integer, String> mates = new HashMap<Integer, String>();
+    // tried to use a hash map.
+
+    private Students(){
+        this.add(new Student(10l, "Christopher"));
+        this.add( new Student(15l, "David"));
+
+
+    }
+
+    @Override
+    public Student[] toArray() {
+        int arraySize = count();
+        Student[] destinationArr = new Student[arraySize];
+        List<Student> sourceList = personList;
+        return sourceList.toArray(destinationArr);
+
+    }
+
+    public static Students getINSTANCE(){
+        return INSTANCE;
+    }
+}
diff --git a/src/main/java/com/github/curriculeon/Teacher.java b/src/main/java/com/github/curriculeon/Teacher.java
new file mode 100644
index 0000000..c1eba39
--- /dev/null
+++ b/src/main/java/com/github/curriculeon/Teacher.java
@@ -0,0 +1,7 @@
+package com.github.curriculeon;
+
+interface Teacher {
+    void teach(Learner learner, Double numberOfHours);
+    void lecture(Learner[] learners, Double numberOfHours);
+
+}
diff --git a/src/test/java/com/github/curriculeon/TestClassroom.java b/src/test/java/com/github/curriculeon/TestClassroom.java
new file mode 100644
index 0000000..a52a607
--- /dev/null
+++ b/src/test/java/com/github/curriculeon/TestClassroom.java
@@ -0,0 +1,41 @@
+package com.github.curriculeon;
+
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Map;
+import java.util.Set;
+
+public class TestClassroom {
+
+
+    @Test
+    public void testHostLecture(){
+        //Given
+        Classroom classroom = Classroom.getClassroom();
+        Teacher teacher = Instructors.getINSTANCE().findById(2l);
+        Integer numberOfStudents = Students.getINSTANCE().count();
+        Double numberOfHoursToLecture = numberOfStudents.doubleValue();
+        Double expectedNumberOfHours = numberOfHoursToLecture / numberOfStudents;
+        Map<Student, Double> preStudyMap = classroom.getStudyMap();
+
+        //When
+        classroom.hostLecture(teacher, numberOfHoursToLecture);
+        Map<Student, Double> postStudyMap = classroom.getStudyMap();
+        Set<Student> keySet = postStudyMap.keySet();
+        for (Student student : keySet) {
+            Double preStudyTime = preStudyMap.get(student);
+            Double expectedStudyTime = preStudyTime + expectedNumberOfHours;
+            Double actualStudyTime = postStudyMap.get(student);
+
+
+
+            //Then
+            Assert.assertEquals(expectedStudyTime, actualStudyTime);
+
+        }
+
+
+    }
+}
diff --git a/src/test/java/com/github/curriculeon/TestInstructor.java b/src/test/java/com/github/curriculeon/TestInstructor.java
new file mode 100644
index 0000000..6511903
--- /dev/null
+++ b/src/test/java/com/github/curriculeon/TestInstructor.java
@@ -0,0 +1,79 @@
+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.function.DoubleUnaryOperator;
+
+public class TestInstructor {
+
+    @Test
+    public void testImplementation(){
+        //Given
+        Instructor instructor = new Instructor(null, null);
+
+        //When
+        boolean expected = instructor instanceof Teacher;
+
+        //Then
+        Assert.assertTrue(expected);
+    }
+
+    @Test
+    public void testInheritance(){
+        //Given
+        Instructor instructor = new Instructor(null, null);
+
+        //When
+        boolean expected = instructor instanceof Person;
+
+        //Then
+        Assert.assertTrue(expected);
+
+    }
+
+    @Test
+    public void testTeach(){
+        //Given
+        Instructor instructor =  new Instructor(null, null);
+        Learner learn = new Student(null, null);
+        Double numberOfTeachingHours = 90.0d;
+        Double hours = learn.getTotalStudyTime();
+        Double expected = hours + numberOfTeachingHours ;
+        //When
+        instructor.teach(learn, numberOfTeachingHours);
+        Double actual = learn.getTotalStudyTime();
+
+        //Then
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testLecture(){
+        //Given
+        Teacher instructor = new Instructor(null, null);
+        Double numberHours = 134d;
+        Learner[] learn = new Learner[] {
+            new Student(22l, "Emmanuel"),
+            new Student(23l, "Mike"),
+            new Student(24l, "Leon")
+        };
+
+        Double expected = numberHours/learn.length;
+
+
+
+        //When
+        instructor.lecture(learn, numberHours);
+
+
+        //Then
+        for (int i = 0; i < learn.length; i++) {
+            Learner learner = learn[i];
+            Double actual = learner.getTotalStudyTime();
+
+            Assert.assertEquals(expected, actual);
+
+        }
+    }
+}
diff --git a/src/test/java/com/github/curriculeon/TestInstructors.java b/src/test/java/com/github/curriculeon/TestInstructors.java
new file mode 100644
index 0000000..eab21be
--- /dev/null
+++ b/src/test/java/com/github/curriculeon/TestInstructors.java
@@ -0,0 +1,24 @@
+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestInstructors {
+
+    @Test
+    public void instructorsSingletonTest(){
+
+        //Given
+        Instructors instructor = Instructors.getINSTANCE();
+        String expected = "Leon";
+
+        //When
+        String actual = instructor.findById(01l).getName();
+        //Then
+
+        Assert.assertEquals(expected, actual);
+        actual = instructor.findById(02l).getName();
+        Assert.assertEquals("Christel", actual);
+    }
+
+}
diff --git a/src/test/java/com/github/curriculeon/TestPeople.java b/src/test/java/com/github/curriculeon/TestPeople.java
new file mode 100644
index 0000000..b3ebc88
--- /dev/null
+++ b/src/test/java/com/github/curriculeon/TestPeople.java
@@ -0,0 +1,70 @@
+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestPeople {
+    /**?
+     * Credits to Leon Christopher Hunter for all the help in building this project.
+     * Without Leon there would be no java project by me.
+     */
+
+    @Test
+    public void testAdd(){
+        //Given
+        People people = Instructors.getINSTANCE();
+
+        Person people1 = new Person();
+        Assert.assertFalse(people.contains(people1));
+
+        //When
+        people.add(people1);
+        //Then
+
+        Assert.assertTrue(people.contains(people1));
+    }
+
+    @Test
+    public void testRemove(){
+        //Given
+        People people = Instructors.getINSTANCE();
+        Person people1 = new Person();
+        Person people2 =new Person();
+
+        people.add(people1);
+        people.add(people2);
+
+        Assert.assertTrue(people.contains(people1));
+        Assert.assertTrue(people.contains(people2));
+
+        //When
+        people.remove(people1);
+        people.remove(people2);
+
+        //Then
+        Assert.assertFalse(people.contains(people1));
+        Assert.assertFalse(people.contains(people2));
+    }
+
+    @Test
+    public void testFindById() {
+        //Given
+        People people = Instructors.getINSTANCE();
+        Person expected = new Person(22l, "Emmanuel");
+        Person people2 =new Person(23l, "Johnson");
+
+        people.add(expected);
+        people.add(people2);
+
+        Assert.assertTrue(people.contains(expected));
+        Assert.assertTrue(people.contains(people2));
+
+        //When
+        Person actual = people.findById(22l);
+
+
+        //Then
+        Assert.assertEquals(expected, actual);
+    }
+
+}
diff --git a/src/test/java/com/github/curriculeon/TestPerson.java b/src/test/java/com/github/curriculeon/TestPerson.java
index 6c523fe..b1b9c76 100644
--- a/src/test/java/com/github/curriculeon/TestPerson.java
+++ b/src/test/java/com/github/curriculeon/TestPerson.java
@@ -1,5 +1,46 @@
 package com.github.curriculeon;
 
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
 public class TestPerson {
 
+    private void testConstructor(long expectedLong, String expectedString){
+        // : Given
+        Person person = new Person(expectedLong, expectedString);
+
+
+        // : When
+        long actualLong = person.getId();
+        String actualString = person.getName();
+
+        // : Then
+        assertEquals(expectedLong, actualLong);
+        assertEquals(expectedString, actualString);
+
+    }
+
+ @Test
+    public void test0(){ testConstructor(20, "abc"); }
+
+@Test
+    public void test1(){testConstructor(10, "Hello World");}
+
+
+@Test
+    public void testSetName(){
+        //Given
+        Person p = new Person(12l, "abced");
+
+        // When
+        String testName = "wwww";
+        p.setName(testName);
+
+
+    //then
+        assertEquals(p.getName(), p.getName());
+
+    }
+
 }
diff --git a/src/test/java/com/github/curriculeon/TestStudent.java b/src/test/java/com/github/curriculeon/TestStudent.java
new file mode 100644
index 0000000..2c80d7c
--- /dev/null
+++ b/src/test/java/com/github/curriculeon/TestStudent.java
@@ -0,0 +1,39 @@
+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestStudent {
+
+    @Test
+    public void testImplementation(){
+        //Given
+         Student student = new Student(null, null);
+        // when
+        boolean expected = student instanceof Learner;
+        //then
+        Assert.assertTrue(expected);
+    }
+
+    @Test
+    public void testInheritance(){
+        Assert.assertTrue(new Student(null, null) instanceof Person);
+    }
+
+
+    @Test
+    public void testLearn(){
+        //Given
+        Student student = new Student(20l, "Emmanuel");
+        Double studentStudyTime = 40.0;
+        Double preStudy = student.getTotalStudyTime();
+        Double expected = studentStudyTime + preStudy;
+        //When
+        student.learn(studentStudyTime);
+        Double actual = student.getTotalStudyTime();
+
+        //then
+
+        Assert.assertEquals(expected,actual);
+    }
+}
diff --git a/src/test/java/com/github/curriculeon/TestStudents.java b/src/test/java/com/github/curriculeon/TestStudents.java
new file mode 100644
index 0000000..3d5d39a
--- /dev/null
+++ b/src/test/java/com/github/curriculeon/TestStudents.java
@@ -0,0 +1,20 @@
+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestStudents {
+
+    @Test
+    public void test(){
+        //Given
+        Students students = Students.getINSTANCE();
+        String expectedStudentName = "David";
+
+
+        //Then
+         String actual = students.findById(15l).getName();
+        //When
+        Assert.assertEquals(expectedStudentName, actual);
+    }
+}