diff --git a/StudentProgressRecord/Entity/Teacher.cs b/StudentProgressRecord/Entity/Teacher.cs
index 2ceea3d..0178753 100644
--- a/StudentProgressRecord/Entity/Teacher.cs
+++ b/StudentProgressRecord/Entity/Teacher.cs
@@ -14,13 +14,13 @@ namespace StudentProgressRecord.Entity
 
         public long DepartmentID { get; set; }
 
-        public static Teacher CreateTeacher(long id, string Fio, long DepartmentID)
+        public static Teacher CreateTeacher(long id, string Fio, long departmentId)
         {
             return new Teacher
             {
                 Id = id,
                 Fio = Fio,
-                DepartmentID = DepartmentID
+                DepartmentID = departmentId
             };
         }
 
diff --git a/StudentProgressRecord/Repositories/IDepartmentRepository.cs b/StudentProgressRecord/Repositories/IDepartmentRepository.cs
new file mode 100644
index 0000000..434fb6d
--- /dev/null
+++ b/StudentProgressRecord/Repositories/IDepartmentRepository.cs
@@ -0,0 +1,20 @@
+using StudentProgressRecord.Entity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StudentProgressRecord.Repositories
+{
+    public interface IDepartmentRepository
+    {
+
+        IEnumerable<Department> ReadDepartments(long? facultyId=null);
+        Department ReadDepartmentById(long id);
+        void CreateDepartment(Department department);
+        void UpdateDepartment(Department department);
+        void DeleteDepartment(long id);
+
+    }
+}
diff --git a/StudentProgressRecord/Repositories/IFacultyRepository.cs b/StudentProgressRecord/Repositories/IFacultyRepository.cs
new file mode 100644
index 0000000..1b1603e
--- /dev/null
+++ b/StudentProgressRecord/Repositories/IFacultyRepository.cs
@@ -0,0 +1,19 @@
+using StudentProgressRecord.Entity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StudentProgressRecord.Repositories
+{
+    public interface IFacultyRepository
+    {
+        IEnumerable<Faculty> ReadFaculties();
+        Faculty ReadFacultyById(long id);
+        void CreateFaculty(Faculty faculty);
+        void UpdateFaculty(Faculty faculty);
+        void DeleteFaculty(long id);
+
+    }
+}
diff --git a/StudentProgressRecord/Repositories/IGroupRepository.cs b/StudentProgressRecord/Repositories/IGroupRepository.cs
new file mode 100644
index 0000000..03213d4
--- /dev/null
+++ b/StudentProgressRecord/Repositories/IGroupRepository.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace StudentProgressRecord.Repositories
+{
+    public interface IGroupRepository
+    {
+        IEnumerable<Group> ReadGroups(long? departmentId=null);
+        Group ReadGroupById(long id);
+        void CreateGroup(Group group);
+        void UpdateGroup(Group group);
+        void DeleteGroup(long id);
+    }
+}
diff --git a/StudentProgressRecord/Repositories/IStatementReposytory.cs b/StudentProgressRecord/Repositories/IStatementReposytory.cs
new file mode 100644
index 0000000..4e561bc
--- /dev/null
+++ b/StudentProgressRecord/Repositories/IStatementReposytory.cs
@@ -0,0 +1,13 @@
+using StudentProgressRecord.Entity;
+
+namespace StudentProgressRecord.Repositories
+{
+    public interface IStatementReposytory
+    {
+        IEnumerable<Statement> ReadStatements(long? subjectId, long? teacherId, long? studentId, DateTime? dateTo=null, int? mark=null);
+        Statement ReadStatementById(long id);
+        void CreateStatement(Statement statement);
+        void UpdateStatement(Statement statement);
+        void DeleteStatement(long id);
+    }
+}
diff --git a/StudentProgressRecord/Repositories/IStudentRepository.cs b/StudentProgressRecord/Repositories/IStudentRepository.cs
new file mode 100644
index 0000000..9197538
--- /dev/null
+++ b/StudentProgressRecord/Repositories/IStudentRepository.cs
@@ -0,0 +1,18 @@
+using StudentProgressRecord.Entity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StudentProgressRecord.Repositories
+{
+    public interface IStudentRepository
+    {
+        IEnumerable<Student> ReadStudents(long? groupId = null, bool? familyPos=null, bool? domitory=null);
+        Student ReadStudentById(long id);
+        void CreateStudent(Student student);
+        void UpdateStudent(Student student);
+        void DeleteStudent(long id);
+    }
+}
diff --git a/StudentProgressRecord/Repositories/ISubjectRepository.cs b/StudentProgressRecord/Repositories/ISubjectRepository.cs
new file mode 100644
index 0000000..a5e3dec
--- /dev/null
+++ b/StudentProgressRecord/Repositories/ISubjectRepository.cs
@@ -0,0 +1,18 @@
+using StudentProgressRecord.Entity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StudentProgressRecord.Repositories
+{
+    public interface ISubjectRepository
+    {
+        IEnumerable<Subject> ReadSubjects();
+        Subject ReadSubjectById(long id);
+        void CreateSubject(Subject subject);
+        void UpdateSubject(Subject subject);
+        void DeleteSubject(long id);
+    }
+}
diff --git a/StudentProgressRecord/Repositories/ITeacherRepository.cs b/StudentProgressRecord/Repositories/ITeacherRepository.cs
new file mode 100644
index 0000000..f88c92f
--- /dev/null
+++ b/StudentProgressRecord/Repositories/ITeacherRepository.cs
@@ -0,0 +1,19 @@
+using StudentProgressRecord.Entity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StudentProgressRecord.Repositories
+{
+    public interface ITeacherRepository
+    {
+
+        IEnumerable<Teacher> ReadTeachers(long? departmentID = null);
+        Teacher ReadTeacherById(long id);
+        void CreateTeacher(Teacher teacher);
+        void UpdateTeacher(Teacher teacher);
+        void DeleteTeacher(long id);
+    }
+}