diff --git a/src/main/java/com/epam/izh/rd/online/entity/Author.java b/src/main/java/com/epam/izh/rd/online/entity/Author.java
index 166be587..da47f237 100644
--- a/src/main/java/com/epam/izh/rd/online/entity/Author.java
+++ b/src/main/java/com/epam/izh/rd/online/entity/Author.java
@@ -5,7 +5,7 @@
 
 /**
  * Класс содержащий информацию об авторе.
- *
+ * <p>
  * Необходимо:
  * 1) Создать список полей с указанными типами ровно в этом порядке:
  * - name с типом String и приватным модификатором доступа
@@ -19,5 +19,73 @@
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
 public class Author {
+    private String name;
+    private String lastName;
+    private LocalDate birthdate;
+    private String country;
 
+    public Author() {
+    }
+
+    public Author(String name, String lastName, LocalDate birthdate, String country) {
+        this.name = name;
+        this.lastName = lastName;
+        this.birthdate = birthdate;
+        this.country = country;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public LocalDate getBirthdate() {
+        return birthdate;
+    }
+
+    public void setBirthdate(LocalDate birthdate) {
+        this.birthdate = birthdate;
+    }
+
+    public String getCountry() {
+        return country;
+    }
+
+    public void setCountry(String country) {
+        this.country = country;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Author author = (Author) o;
+        return name.equals(author.name) && lastName.equals(author.lastName) && birthdate.equals(author.birthdate) && country.equals(author.country);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name, lastName, birthdate, country);
+    }
+
+    @Override
+    public String toString() {
+        return "Author{" +
+                "name='" + name + '\'' +
+                ", lastName='" + lastName + '\'' +
+                ", birthdate=" + birthdate +
+                ", country='" + country + '\'' +
+                '}';
+    }
 }
diff --git a/src/main/java/com/epam/izh/rd/online/entity/Book.java b/src/main/java/com/epam/izh/rd/online/entity/Book.java
index 08bdccb8..8bc615b5 100644
--- a/src/main/java/com/epam/izh/rd/online/entity/Book.java
+++ b/src/main/java/com/epam/izh/rd/online/entity/Book.java
@@ -15,6 +15,52 @@
  * 5) Переопределить методы equals и hashCode - используйте генерацию (не забывайте alt+inset)
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
-public abstract class Book {
+public abstract class Book { 
+    private int numberOfPages;
+    private String name;
 
+    public Book() {
+    }
+
+    public Book(int numberOfPages, String name) {
+        this.numberOfPages = numberOfPages;
+        this.name = name;
+    }
+
+    public int getNumberOfPages() {
+        return numberOfPages;
+    }
+
+    public void setNumberOfPages(int numberOfPages) {
+        this.numberOfPages = numberOfPages;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Book book = (Book) o;
+        return numberOfPages == book.numberOfPages && name.equals(book.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(numberOfPages, name);
+    }
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "numberOfPages=" + numberOfPages +
+                ", name='" + name + '\'' +
+                '}';
+    }
 }
diff --git a/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java b/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java
index a9834db4..dd76e993 100644
--- a/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java
+++ b/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java
@@ -5,7 +5,7 @@
 
 /**
  * Сущность учебника. Он должен быть унаследован от сущности Book
- *
+ * <p>
  * Необходимо:
  * 1) Унаследовать данный класс от класса Book
  * 2) Создать список полей с указанными типами ровно в этом порядке:
@@ -19,6 +19,67 @@
  * 5) Переопределить методы equals и hashCode - используйте генерацию (не забывайте alt+inset)
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
+
+
 public class SchoolBook extends Book {
+    private String authorName;
+    private String authorLastName;
+    private LocalDate publishDate;
+
+    public SchoolBook() {
+    }
+
+    public SchoolBook(int numberOfPages, String name, String authorName, String authorLastName, LocalDate publishDate) {
+        super(numberOfPages, name);
+        this.authorName = authorName;
+        this.authorLastName = authorLastName;
+        this.publishDate = publishDate;
+    }
+
+    public String getAuthorName() {
+        return authorName;
+    }
+
+    public void setAuthorName(String authorName) {
+        this.authorName = authorName;
+    }
+
+    public String getAuthorLastName() {
+        return authorLastName;
+    }
+
+    public void setAuthorLastName(String authorLastName) {
+        this.authorLastName = authorLastName;
+    }
+
+    public LocalDate getPublishDate() {
+        return publishDate;
+    }
+
+    public void setPublishDate(LocalDate publishDate) {
+        this.publishDate = publishDate;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        if (!super.equals(o)) return false;
+        SchoolBook that = (SchoolBook) o;
+        return authorName.equals(that.authorName) && authorLastName.equals(that.authorLastName) && publishDate.equals(that.publishDate);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), authorName, authorLastName, publishDate);
+    }
 
+    @Override
+    public String toString() {
+        return "SchoolBook{" +
+                "authorName='" + authorName + '\'' +
+                ", authorLastName='" + authorLastName + '\'' +
+                ", publishDate=" + publishDate +
+                '}';
+    }
 }
diff --git a/src/main/java/com/epam/izh/rd/online/repository/SimpleAuthorRepository.java b/src/main/java/com/epam/izh/rd/online/repository/SimpleAuthorRepository.java
new file mode 100644
index 00000000..084f9d12
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/repository/SimpleAuthorRepository.java
@@ -0,0 +1,57 @@
+package com.epam.izh.rd.online.repository;
+
+import com.epam.izh.rd.online.entity.Author;
+
+import java.util.Arrays;
+import java.util.Objects;
+
+public class SimpleAuthorRepository implements AuthorRepository {
+
+    private Author[] authors = new Author[0];
+
+    @Override
+    public boolean save(Author author) {
+        boolean isAuthor = findByFullName(author.getName(), author.getLastName()) == null;
+        if (isAuthor) {
+            Author[] tempAuthors = new Author[authors.length + 1];
+            System.arraycopy(authors, 0, tempAuthors, 0, authors.length);
+            tempAuthors[tempAuthors.length - 1] = author;
+            authors = tempAuthors;
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public Author findByFullName(String name, String lastname) {
+        boolean isName = false;
+        boolean isLastName = false;
+        for (Author authorForEach : authors) {
+//            Arrays.stream(authors).forEach(authorForEach.getName()::equals);
+            isName = name == authorForEach.getName();
+            isLastName = lastname == authorForEach.getLastName();
+            if (isName && isLastName) {
+                return authorForEach;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public boolean remove(Author author) {
+        boolean isAuthor = author.equals(findByFullName(author.getName(), author.getLastName()));
+        if (isAuthor) {
+            Author[] tempAuthors = Arrays.stream(authors)
+                    .filter(authorDel -> !author.equals(authorDel))
+                    .toArray(Author[]::new);
+            authors = tempAuthors;
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public int count() {
+        return authors.length;
+    }
+}
diff --git a/src/main/java/com/epam/izh/rd/online/repository/SimpleSchoolBookRepository.java b/src/main/java/com/epam/izh/rd/online/repository/SimpleSchoolBookRepository.java
new file mode 100644
index 00000000..15eb1394
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/repository/SimpleSchoolBookRepository.java
@@ -0,0 +1,57 @@
+package com.epam.izh.rd.online.repository;
+
+import com.epam.izh.rd.online.entity.SchoolBook;
+
+import java.util.Arrays;
+
+public class SimpleSchoolBookRepository implements BookRepository<SchoolBook> {
+
+    private SchoolBook[] schoolBooks = new SchoolBook[0];
+
+    @Override
+    public boolean save(SchoolBook book) {
+        SchoolBook[] tempSchoolBooks = new SchoolBook[schoolBooks.length + 1];
+        System.arraycopy(schoolBooks, 0, tempSchoolBooks, 0, schoolBooks.length);
+        tempSchoolBooks[tempSchoolBooks.length - 1] = book;
+        schoolBooks = tempSchoolBooks;
+        return true;
+    }
+
+    @Override
+    public SchoolBook[] findByName(String name) {
+        return Arrays.stream(schoolBooks)
+                .filter(nameField -> name.equals(nameField.getName()))
+                .toArray(SchoolBook[]::new);
+    }
+
+    /**
+     * Метод должен удалять книги из массива schoolBooks по названию.
+     * Если книг с одинаковым названием в массиве несколько, метод должен удалить их все.
+     * <p>
+     * Важно: при удалении книги из массива размер массива должен уменьшиться!
+     * То есть, если мы сохранили 2 разные книги и вызвали count() (метод ниже), то он должен вернуть 2.
+     * Если после этого мы удалили 1 книгу, метод count() должен вернуть 1.
+     * <p>
+     * Если хотя бы одна книга была найдена и удалена, метод должен вернуть true, в противном случае,
+     * если книга не была найдена, метод должен вернуть false.
+     */
+
+    @Override
+    public boolean removeByName(String name) {
+        boolean isContain = Arrays.stream(schoolBooks)
+                .anyMatch(nameField -> name.equals(nameField.getName()));
+        if (isContain) {
+            SchoolBook[] temp = Arrays.stream(schoolBooks)
+                    .filter(nameField -> !name.equals(nameField.getName()))
+                    .toArray(SchoolBook[]::new);
+            schoolBooks = temp;
+            return true;
+        }
+        return isContain;
+    }
+
+    @Override
+    public int count() {
+        return schoolBooks.length;
+    }
+}
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleAuthorService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleAuthorService.java
new file mode 100644
index 00000000..b29370d7
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleAuthorService.java
@@ -0,0 +1,36 @@
+package com.epam.izh.rd.online.service;
+
+import com.epam.izh.rd.online.entity.Author;
+import com.epam.izh.rd.online.repository.AuthorRepository;
+
+public class SimpleAuthorService implements AuthorService {
+
+    private AuthorRepository authorRepository;
+
+    public SimpleAuthorService() {
+    }
+
+    public SimpleAuthorService(AuthorRepository authorRepository) {
+        this.authorRepository = authorRepository;
+    }
+
+    @Override
+    public boolean save(Author author) {
+        return authorRepository.save(author);
+    }
+
+    @Override
+    public Author findByFullName(String name, String lastname) {
+        return authorRepository.findByFullName(name, lastname);
+    }
+
+    @Override
+    public boolean remove(Author author) {
+        return authorRepository.remove(author);
+    }
+
+    @Override
+    public int count() {
+        return authorRepository.count();
+    }
+}
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleSchoolBookService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleSchoolBookService.java
new file mode 100644
index 00000000..4611e1e6
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleSchoolBookService.java
@@ -0,0 +1,57 @@
+package com.epam.izh.rd.online.service;
+
+import com.epam.izh.rd.online.entity.Author;
+import com.epam.izh.rd.online.entity.SchoolBook;
+import com.epam.izh.rd.online.repository.BookRepository;
+
+
+public class SimpleSchoolBookService implements BookService<SchoolBook> {
+    private BookRepository<SchoolBook> schoolBookBookRepository;
+    private AuthorService authorService;
+
+    public SimpleSchoolBookService() {
+    }
+
+    public SimpleSchoolBookService(BookRepository<SchoolBook> schoolBookBookRepository, AuthorService authorService) {
+        this.schoolBookBookRepository = schoolBookBookRepository;
+        this.authorService = authorService;
+    }
+
+    @Override
+    public boolean save(SchoolBook book) {
+        if (authorService.findByFullName(book.getAuthorName(), book.getAuthorLastName()) != null) {
+            schoolBookBookRepository.save(book);
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public SchoolBook[] findByName(String name) {
+        return schoolBookBookRepository.findByName(name);
+    }
+
+    @Override
+    public int getNumberOfBooksByName(String name) {
+        return schoolBookBookRepository.findByName(name).length;
+    }
+
+    @Override
+    public boolean removeByName(String name) {
+        return schoolBookBookRepository.removeByName(name);
+    }
+
+    @Override
+    public int count() {
+        return schoolBookBookRepository.count();
+    }
+
+    @Override
+    public Author findAuthorByBookName(String name) {
+        SchoolBook[] forSearch = schoolBookBookRepository.findByName(name);
+        if (forSearch.length == 0) {
+            return null;
+        }
+        return authorService.findByFullName(forSearch[0].getAuthorName(), forSearch[0].getAuthorLastName());
+    }
+}