diff --git a/1ano/2semestre/poo/src/aula06/Bolser.java b/1ano/2semestre/poo/src/aula06/Bolser.java
new file mode 100644
index 0000000..77a08e4
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula06/Bolser.java
@@ -0,0 +1,43 @@
+package aula06;
+
+import utils.DateYMD;
+
+public class Bolser extends Student{
+    private Professor supervisor;
+    private double monthlyAmount;
+
+    public Bolser(String name, int cc, DateYMD birthDate, DateYMD registrationDate, Professor supervisor, double monthlyAmount) {
+        super(name, cc, birthDate, registrationDate);
+        this.setSupervisor(supervisor);
+        this.setMonthlyAmount(monthlyAmount);
+    }
+
+    public Bolser(String name, int cc, DateYMD birthDate, Professor supervisor, double monthlyAmount) {
+        this(name, cc, birthDate, null, supervisor, monthlyAmount);
+    }
+
+    public Professor getSupervisor() {
+        return this.supervisor;
+    }
+    public void setSupervisor(Professor supervisor) {
+        if (supervisor == null) {
+            throw new IllegalArgumentException("Supervisor cannot be null");
+        }
+        this.supervisor = supervisor;
+    }
+
+    public double getMonthlyAmount() {
+        return this.monthlyAmount;
+    }
+    public void setMonthlyAmount(double monthlyAmount) {
+        if (monthlyAmount < 0) {
+            throw new IllegalArgumentException("Monthly amount cannot be negative");
+        }
+        this.monthlyAmount = monthlyAmount;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("%s; CC: %d; Date de nascimento: %s; Data de matrícula: %s; NMec: %d; Supervisor: %s; Montante mensal: %.2f", this.getName(), this.getCc(), this.getBirthDate(), this.getRegistrationDate(), this.getNMec(), this.supervisor, this.monthlyAmount);
+    }
+}
diff --git a/1ano/2semestre/poo/src/aula06/Person.java b/1ano/2semestre/poo/src/aula06/Person.java
new file mode 100644
index 0000000..6d46a70
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula06/Person.java
@@ -0,0 +1,47 @@
+package aula06;
+
+import utils.DateYMD;
+
+public class Person {
+    private String name;
+    private int cc;
+    private DateYMD birthDate;
+
+    public Person(String name, int cc, DateYMD birthDate) {
+        this.setName(name);
+        this.setCc(cc);
+        this.setBirthDate(birthDate);
+    }
+
+    public String getName() {
+        return this.name;
+    }
+    public void setName(String name) {
+        if (name == null || name.isEmpty()) {
+            throw new IllegalArgumentException("Name cannot be null or empty");
+        }
+        this.name = name;
+    }
+
+    public int getCc() {
+        return this.cc;
+    }
+    public void setCc(int cc) {
+        this.cc = cc;
+    }
+
+    public DateYMD getBirthDate() {
+        return this.birthDate;
+    }
+    public void setBirthDate(DateYMD birthDate) {
+        if (birthDate == null) {
+            throw new IllegalArgumentException("Birth date cannot be null");
+        }
+        this.birthDate = birthDate;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("%s; CC: %d; Date de nascimento: %s", this.name, this.cc, this.birthDate);
+    }
+}
diff --git a/1ano/2semestre/poo/src/aula06/PersonTest.java b/1ano/2semestre/poo/src/aula06/PersonTest.java
new file mode 100644
index 0000000..134b306
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula06/PersonTest.java
@@ -0,0 +1,21 @@
+package aula06;
+
+import java.util.Scanner;
+import utils.DateYMD;
+
+public class PersonTest {
+    public static void main(String[] args) {
+        Scanner sin = new Scanner(System.in);
+
+        Student al = new Student ("Andreia Melo", 9855678,new DateYMD(18, 7, 1990), new DateYMD(1, 9, 2018));
+        Professor p1 = new Professor("Jorge Almeida", 3467225, new DateYMD(13, 3, 1967), "Associado", "Informática");
+        Bolser bls = new Bolser ("Igor Santos", 8976543, new DateYMD(11, 5, 1985), p1, 900);
+        bls.setMonthlyAmount(1050);
+        System.out.println("Student:"+ al.getName());
+        System.out.println(al);
+        System.out.println("Bolser:"+ bls.getName() + ", NMec: " + bls.getNMec() + ", Bolsa:" +  bls.getMonthlyAmount()+ ", Orientador:" +  bls.getSupervisor());
+        System.out.println(bls);
+
+        sin.close();
+    }
+}
diff --git a/1ano/2semestre/poo/src/aula06/Professor.java b/1ano/2semestre/poo/src/aula06/Professor.java
new file mode 100644
index 0000000..55dd541
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula06/Professor.java
@@ -0,0 +1,39 @@
+package aula06;
+
+import utils.DateYMD;
+
+public class Professor extends Person {
+    private String category;
+    private String department;
+
+    public Professor(String name, int cc, DateYMD birthDate, String category, String department) {
+        super(name, cc, birthDate);
+        this.setCategory(category);
+        this.setDepartment(department);
+    }
+
+    public String getCategory() {
+        return this.category;
+    }
+    public void setCategory(String category) {
+        if (category == null || category.isEmpty()) {
+            throw new IllegalArgumentException("Category cannot be null or empty");
+        }
+        this.category = category;
+    }
+
+    public String getDepartment() {
+        return this.department;
+    }
+    public void setDepartment(String department) {
+        if (department == null || department.isEmpty()) {
+            throw new IllegalArgumentException("Department cannot be null or empty");
+        }
+        this.department = department;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("%s; CC: %d; Date de nascimento: %s; Categoria: %s; Departamento: %s", this.getName(), this.getCc(), this.getBirthDate(), this.category, this.department);
+    }
+}
diff --git a/1ano/2semestre/poo/src/aula06/Student.java b/1ano/2semestre/poo/src/aula06/Student.java
new file mode 100644
index 0000000..458d990
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula06/Student.java
@@ -0,0 +1,40 @@
+package aula06;
+
+import utils.DateYMD;
+import java.time.LocalDate;
+
+public class Student extends Person {
+    private DateYMD registrationDate;
+    private int nMec;
+    public static int currentNMec = 100;
+
+    public Student(String name, int cc, DateYMD birthDate, DateYMD registrationDate) {
+        super(name, cc, birthDate);
+        this.setRegistrationDate(registrationDate);
+        this.setNMec(Student.currentNMec++);
+    }
+
+    public Student(String name, int age, DateYMD birthDate) {
+        this(name, age, birthDate, null);
+    }
+
+    public int getNMec() {
+        return this.nMec;
+    }
+    public void setNMec(int nMec) {
+        this.nMec = nMec;
+    }
+
+    public DateYMD getRegistrationDate() {
+        return this.registrationDate;
+    }
+    public void setRegistrationDate(DateYMD registrationDate) {
+        LocalDate now = LocalDate.now();
+        this.registrationDate = registrationDate == null ? new DateYMD(now.getDayOfMonth(), now.getMonthValue(), now.getYear()) : registrationDate;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("%s; CC: %d; Date de nascimento: %s; Data de matrícula: %s; NMec: %d", this.getName(), this.getCc(), this.getBirthDate(), this.registrationDate, this.nMec);
+    }
+}