diff --git a/src/Main.java b/src/Main.java
index 273105c..b75a9b0 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -8,20 +8,18 @@ import java.util.ArrayList;
 public class Main {
     public static void main(String[] args) {
         Scientist s1 = new SeniorScientist(1000, 10);
-        Scientist s2 = new SeniorScientist(1000, 10); // дубликат s1
+        Scientist s2 = new SeniorScientist(1000, 10);
         Scientist j1 = new JuniorScientist(800, 5);
         Scientist j2 = new JuniorScientist(900, 6);
-        Scientist j3 = new JuniorScientist(800, 5);    // дубликат j1
+        Scientist j3 = new JuniorScientist(800, 5);
         Scientist e1 = new Engineer(700, 4);
-        Scientist e2 = new Engineer(700, 4);           // дубликат e1
+        Scientist e2 = new Engineer(700, 4);
         Scientist e3 = new Engineer(750, 3);
         Scientist s3 = new SeniorScientist(1100, 8);
         Scientist j4 = new JuniorScientist(950, 7);
 
-        // Массив всех объектов
         Scientist[] allScientists = { s1, s2, j1, j2, j3, e1, e2, e3, s3, j4 };
 
-        // Формирование списка уникальных объектов (используем equals() для проверки)
         ArrayList<Scientist> uniqueScientists = new ArrayList<>();
         for (Scientist sc : allScientists) {
             if (!uniqueScientists.contains(sc)) {
@@ -29,16 +27,7 @@ public class Main {
             }
         }
 
-        // Демонстрация установки характеристик через set-методы (пример)
-        if (!uniqueScientists.isEmpty()) {
-            Scientist first = uniqueScientists.get(0);
-            // Изменим ставку и стаж для первого объекта
-            first.setSalary(1050);
-            first.setSeniority(11);
-        }
-
-        // Вывод характеристик каждого уникального объекта через перегруженный метод toString()
-        System.out.println("Характеристики уникальных научных сотрудников:");
+        System.out.println("Уникальные научные сотрудники:");
         for (Scientist sc : uniqueScientists) {
             System.out.println(sc.toString());
         }
diff --git a/src/base/EmployeeActions.java b/src/base/EmployeeActions.java
new file mode 100644
index 0000000..7562ee2
--- /dev/null
+++ b/src/base/EmployeeActions.java
@@ -0,0 +1,8 @@
+package base;
+
+public interface EmployeeActions {
+    void hire();
+    void fire();
+    void transfer();
+    void accrueSalary();
+}
diff --git a/src/base/Scientist.java b/src/base/Scientist.java
index 810433a..4e8a766 100644
--- a/src/base/Scientist.java
+++ b/src/base/Scientist.java
@@ -1,77 +1,9 @@
 package base;
 
-public abstract class Scientist {
-    protected double salary;
-    protected int seniority;
-
-    public Scientist(double salary, int seniority) {
-        this.salary = salary;
-        this.seniority = seniority;
-    }
-
-    public double getSalary() {
-        return salary;
-    }
-
-    public void setSalary(double salary) {
-        this.salary = salary;
-    }
-
-    public int getSeniority() {
-        return seniority;
-    }
-
-    public void setSeniority(int seniority) {
-        this.seniority = seniority;
-    }
-
-    // Абстрактный метод вычисления надбавки
-    public abstract double computeBonus();
-
-    // Методы действий
-    public void hire() {
-        System.out.println(getClass().getSimpleName() + " принят на работу.");
-    }
-
-    public void fire() {
-        System.out.println(getClass().getSimpleName() + " уволен.");
-    }
-
-    public void transfer() {
-        System.out.println(getClass().getSimpleName() + " перемещён на новую должность.");
-    }
-
-    public void accrueSalary() {
-        double bonus = computeBonus();
-        double totalSalary = salary + bonus;
-        System.out.println("Начислена зарплата: " + totalSalary +
-                " (ставка: " + salary + ", надбавка: " + bonus + ")");
-    }
-
-    // Переопределение equals() и hashCode() для проверки уникальности объектов
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-
-        Scientist scientist = (Scientist) o;
-        return Double.compare(scientist.salary, salary) == 0 &&
-                seniority == scientist.seniority;
-    }
-
-    @Override
-    public int hashCode() {
-        return java.util.Objects.hash(getClass(), salary, seniority);
-    }
-
-    // Переопределение toString() для вывода характеристик объекта
-    @Override
-    public String toString() {
-        return getClass().getSimpleName() +
-                " { salary = " + salary +
-                ", seniority = " + seniority +
-                ", bonus = " + computeBonus() +
-                ", totalSalary = " + (salary + computeBonus()) +
-                " }";
-    }
+public interface Scientist {
+    double getSalary();
+    void setSalary(double salary);
+    int getSeniority();
+    void setSeniority(int seniority);
+    double computeBonus();
 }
diff --git a/src/engineer/Engineer.java b/src/engineer/Engineer.java
index c09fd12..78a692f 100644
--- a/src/engineer/Engineer.java
+++ b/src/engineer/Engineer.java
@@ -1,16 +1,67 @@
 package engineer;
 
 import base.Scientist;
+import base.EmployeeActions;
 
-public class Engineer extends Scientist {
+public class Engineer implements Scientist, EmployeeActions {
+    private double salary;
+    private int seniority;
 
     public Engineer(double salary, int seniority) {
-        super(salary, seniority); // вызов конструктора суперкласса
+        this.salary = salary;
+        this.seniority = seniority;
     }
 
     @Override
     public double computeBonus() {
-        double x = 0.01;
-        return salary * seniority * x;
+        return salary * seniority * 0.01;
+    }
+
+    @Override
+    public double getSalary() {
+        return salary;
+    }
+
+    @Override
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+
+    @Override
+    public int getSeniority() {
+        return seniority;
+    }
+
+    @Override
+    public void setSeniority(int seniority) {
+        this.seniority = seniority;
+    }
+
+    @Override
+    public void hire() {
+        System.out.println("Engineer hired.");
+    }
+
+    @Override
+    public void fire() {
+        System.out.println("Engineer fired.");
+    }
+
+    @Override
+    public void transfer() {
+        System.out.println("Engineer transferred.");
+    }
+
+    @Override
+    public void accrueSalary() {
+        System.out.println("Total salary: " + (salary + computeBonus()));
+    }
+
+    @Override
+    public String toString() {
+        return "Engineer { salary = " + salary +
+                ", seniority = " + seniority +
+                ", bonus = " + computeBonus() +
+                ", totalSalary = " + (salary + computeBonus()) + " }";
     }
 }
diff --git a/src/junior/JuniorScientist.java b/src/junior/JuniorScientist.java
index 88111d3..f969f6f 100644
--- a/src/junior/JuniorScientist.java
+++ b/src/junior/JuniorScientist.java
@@ -1,16 +1,67 @@
 package junior;
 
 import base.Scientist;
+import base.EmployeeActions;
 
-public class JuniorScientist extends Scientist {
+public class JuniorScientist implements Scientist, EmployeeActions {
+    private double salary;
+    private int seniority;
 
     public JuniorScientist(double salary, int seniority) {
-        super(salary, seniority); // вызов конструктора суперкласса
+        this.salary = salary;
+        this.seniority = seniority;
     }
 
     @Override
     public double computeBonus() {
-        double x = 0.02;
-        return salary * seniority * x;
+        return salary * seniority * 0.02;
+    }
+
+    @Override
+    public double getSalary() {
+        return salary;
+    }
+
+    @Override
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+
+    @Override
+    public int getSeniority() {
+        return seniority;
+    }
+
+    @Override
+    public void setSeniority(int seniority) {
+        this.seniority = seniority;
+    }
+
+    @Override
+    public void hire() {
+        System.out.println("Junior Scientist hired.");
+    }
+
+    @Override
+    public void fire() {
+        System.out.println("Junior Scientist fired.");
+    }
+
+    @Override
+    public void transfer() {
+        System.out.println("Junior Scientist transferred.");
+    }
+
+    @Override
+    public void accrueSalary() {
+        System.out.println("Total salary: " + (salary + computeBonus()));
+    }
+
+    @Override
+    public String toString() {
+        return "JuniorScientist { salary = " + salary +
+                ", seniority = " + seniority +
+                ", bonus = " + computeBonus() +
+                ", totalSalary = " + (salary + computeBonus()) + " }";
     }
 }
diff --git a/src/senior/SeniorScientist.java b/src/senior/SeniorScientist.java
index eccde91..04b86ab 100644
--- a/src/senior/SeniorScientist.java
+++ b/src/senior/SeniorScientist.java
@@ -1,16 +1,67 @@
 package senior;
 
 import base.Scientist;
+import base.EmployeeActions;
 
-public class SeniorScientist extends Scientist {
+public class SeniorScientist implements Scientist, EmployeeActions {
+    private double salary;
+    private int seniority;
 
     public SeniorScientist(double salary, int seniority) {
-        super(salary, seniority); // вызов конструктора суперкласса
+        this.salary = salary;
+        this.seniority = seniority;
     }
 
     @Override
     public double computeBonus() {
-        double x = 0.03;
-        return salary * seniority * x;
+        return salary * seniority * 0.03;
+    }
+
+    @Override
+    public double getSalary() {
+        return salary;
+    }
+
+    @Override
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+
+    @Override
+    public int getSeniority() {
+        return seniority;
+    }
+
+    @Override
+    public void setSeniority(int seniority) {
+        this.seniority = seniority;
+    }
+
+    @Override
+    public void hire() {
+        System.out.println("Senior Scientist hired.");
+    }
+
+    @Override
+    public void fire() {
+        System.out.println("Senior Scientist fired.");
+    }
+
+    @Override
+    public void transfer() {
+        System.out.println("Senior Scientist transferred.");
+    }
+
+    @Override
+    public void accrueSalary() {
+        System.out.println("Total salary: " + (salary + computeBonus()));
+    }
+
+    @Override
+    public String toString() {
+        return "SeniorScientist { salary = " + salary +
+                ", seniority = " + seniority +
+                ", bonus = " + computeBonus() +
+                ", totalSalary = " + (salary + computeBonus()) + " }";
     }
 }
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