diff --git a/Medical/Medical.sln b/Medical/Medical.sln
index 8009134..38bd9c0 100644
--- a/Medical/Medical.sln
+++ b/Medical/Medical.sln
@@ -5,9 +5,11 @@ VisualStudioVersion = 17.9.34714.143
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MedicalView", "MedicalView\MedicalView.csproj", "{9CEA3FF8-036C-4844-9376-8B09E8507E7F}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MedicalDatabaseContracts", "MedicalDatabaseContracts\MedicalDatabaseContracts.csproj", "{43A2B5DF-F305-412B-BE81-161E0B495AEB}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MedicalDatabaseContracts", "MedicalDatabaseContracts\MedicalDatabaseContracts.csproj", "{43A2B5DF-F305-412B-BE81-161E0B495AEB}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MedicalPostgresqlDatabase", "MedicalPostgresqlDatabase\MedicalPostgresqlDatabase.csproj", "{2BAF4C2E-DC1E-443B-85CC-4F44A8C98E17}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MedicalPostgresqlDatabase", "MedicalPostgresqlDatabase\MedicalPostgresqlDatabase.csproj", "{2BAF4C2E-DC1E-443B-85CC-4F44A8C98E17}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MedicalBusinessLogic", "MedicalBusinessLogic\MedicalBusinessLogic.csproj", "{91F8C37D-9865-42E2-A9AC-4A672259FD31}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -27,6 +29,10 @@ Global
 		{2BAF4C2E-DC1E-443B-85CC-4F44A8C98E17}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{2BAF4C2E-DC1E-443B-85CC-4F44A8C98E17}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{2BAF4C2E-DC1E-443B-85CC-4F44A8C98E17}.Release|Any CPU.Build.0 = Release|Any CPU
+		{91F8C37D-9865-42E2-A9AC-4A672259FD31}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{91F8C37D-9865-42E2-A9AC-4A672259FD31}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{91F8C37D-9865-42E2-A9AC-4A672259FD31}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{91F8C37D-9865-42E2-A9AC-4A672259FD31}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/Medical/MedicalBusinessLogic/BusinessLogics/DiagnoseLogic.cs b/Medical/MedicalBusinessLogic/BusinessLogics/DiagnoseLogic.cs
new file mode 100644
index 0000000..eaf605e
--- /dev/null
+++ b/Medical/MedicalBusinessLogic/BusinessLogics/DiagnoseLogic.cs
@@ -0,0 +1,45 @@
+using MedicalDatabaseContracts;
+using MedicalDatabaseContracts.Models;
+using MedicalDatabaseContracts.SearchModels;
+using MedicalDatabaseContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace MedicalBusinessLogic.BusinessLogics
+{
+    public class DiagnoseLogic : ILogic<Diagnose, DiagnoseViewModel, DiagnoseSearchModel>
+    {
+        private readonly IStorage<Diagnose> _diagnoseStorage;
+        private readonly ILogger<DiagnoseLogic> _logger;
+
+        public DiagnoseLogic(IStorage<Diagnose> diagnoseStorage, ILogger<DiagnoseLogic> logger)
+        {
+            _diagnoseStorage = diagnoseStorage;
+            _logger = logger;
+        }
+
+        public bool Create(Diagnose model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Delete(Diagnose model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public DiagnoseViewModel? ReadElement(DiagnoseSearchModel searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public List<DiagnoseViewModel>? ReadList(DiagnoseSearchModel? searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Update(Diagnose model)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Medical/MedicalBusinessLogic/BusinessLogics/DoctorLogic.cs b/Medical/MedicalBusinessLogic/BusinessLogics/DoctorLogic.cs
new file mode 100644
index 0000000..075504b
--- /dev/null
+++ b/Medical/MedicalBusinessLogic/BusinessLogics/DoctorLogic.cs
@@ -0,0 +1,45 @@
+using MedicalDatabaseContracts;
+using MedicalDatabaseContracts.Models;
+using MedicalDatabaseContracts.SearchModels;
+using MedicalDatabaseContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace MedicalBusinessLogic.BusinessLogics
+{
+    public class DoctorLogic : ILogic<Doctor, DoctorViewModel, DoctorSearchModel>
+    {
+        private readonly IStorage<Doctor> _doctorStorage;
+        private readonly ILogger<DoctorLogic> _logger;
+
+        public DoctorLogic(IStorage<Doctor> doctorStorage, ILogger<DoctorLogic> logger)
+        {
+            _doctorStorage = doctorStorage;
+            _logger = logger;
+        }
+
+        public bool Create(Doctor model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Delete(Doctor model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public DoctorViewModel? ReadElement(DoctorSearchModel searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public List<DoctorViewModel>? ReadList(DoctorSearchModel? searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Update(Doctor model)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Medical/MedicalBusinessLogic/BusinessLogics/PatientLogic.cs b/Medical/MedicalBusinessLogic/BusinessLogics/PatientLogic.cs
new file mode 100644
index 0000000..f04d5b7
--- /dev/null
+++ b/Medical/MedicalBusinessLogic/BusinessLogics/PatientLogic.cs
@@ -0,0 +1,45 @@
+using MedicalDatabaseContracts;
+using MedicalDatabaseContracts.Models;
+using MedicalDatabaseContracts.SearchModels;
+using MedicalDatabaseContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace MedicalBusinessLogic.BusinessLogics
+{
+    public class PatientLogic : ILogic<Patient, PatientViewModel, PatientSearchModel>
+    {
+        private readonly IStorage<Patient> _patientStorage;
+        private readonly ILogger<PatientLogic> _logger;
+
+        public PatientLogic(IStorage<Patient> patientStorage, ILogger<PatientLogic> logger)
+        {
+            _patientStorage = patientStorage;
+            _logger = logger;
+        }
+
+        public bool Create(Patient model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Delete(Patient model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public PatientViewModel? ReadElement(PatientSearchModel searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public List<PatientViewModel>? ReadList(PatientSearchModel? searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Update(Patient model)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Medical/MedicalBusinessLogic/BusinessLogics/SpecializationLogic.cs b/Medical/MedicalBusinessLogic/BusinessLogics/SpecializationLogic.cs
new file mode 100644
index 0000000..a41a9a6
--- /dev/null
+++ b/Medical/MedicalBusinessLogic/BusinessLogics/SpecializationLogic.cs
@@ -0,0 +1,45 @@
+using MedicalDatabaseContracts;
+using MedicalDatabaseContracts.Models;
+using MedicalDatabaseContracts.SearchModels;
+using MedicalDatabaseContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace MedicalBusinessLogic.BusinessLogics
+{
+    public class SpecializationLogic : ILogic<Specialization, SpecializationViewModel, SpecializationSearchModel>
+    {
+        private readonly IStorage<Specialization> _specializationStorage;
+        private readonly ILogger<SpecializationLogic> _logger;
+
+        public SpecializationLogic(IStorage<Specialization> specializationStorage, ILogger<SpecializationLogic> logger)
+        {
+            _specializationStorage = specializationStorage;
+            _logger = logger;
+        }
+
+        public bool Create(Specialization model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Delete(Specialization model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public SpecializationViewModel? ReadElement(SpecializationSearchModel searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public List<SpecializationViewModel>? ReadList(SpecializationSearchModel? searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Update(Specialization model)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Medical/MedicalBusinessLogic/BusinessLogics/VisitLogic.cs b/Medical/MedicalBusinessLogic/BusinessLogics/VisitLogic.cs
new file mode 100644
index 0000000..d5a40a0
--- /dev/null
+++ b/Medical/MedicalBusinessLogic/BusinessLogics/VisitLogic.cs
@@ -0,0 +1,45 @@
+using MedicalDatabaseContracts;
+using MedicalDatabaseContracts.Models;
+using MedicalDatabaseContracts.SearchModels;
+using MedicalDatabaseContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace MedicalBusinessLogic.BusinessLogics
+{
+    public class VisitLogic : ILogic<Visit, VisitViewModel, VisitSearchModel>
+    {
+        private readonly IStorage<Visit> _visitStorage;
+        private readonly ILogger<VisitLogic> _logger;
+
+        public VisitLogic(IStorage<Visit> visitStorage, ILogger<VisitLogic> logger)
+        {
+            _visitStorage = visitStorage;
+            _logger = logger;
+        }
+
+        public bool Create(Visit model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Delete(Visit model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public VisitViewModel? ReadElement(VisitSearchModel searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public List<VisitViewModel>? ReadList(VisitSearchModel? searchModel)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Update(Visit model)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Medical/MedicalBusinessLogic/MedicalBusinessLogic.csproj b/Medical/MedicalBusinessLogic/MedicalBusinessLogic.csproj
new file mode 100644
index 0000000..321fca0
--- /dev/null
+++ b/Medical/MedicalBusinessLogic/MedicalBusinessLogic.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\MedicalDatabaseContracts\MedicalDatabaseContracts.csproj" />
+    <ProjectReference Include="..\MedicalPostgresqlDatabase\MedicalPostgresqlDatabase.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/Medical/MedicalDatabaseContracts/SearchModels/AbstractPersonSearchModel.cs b/Medical/MedicalDatabaseContracts/SearchModels/AbstractPersonSearchModel.cs
new file mode 100644
index 0000000..041bd36
--- /dev/null
+++ b/Medical/MedicalDatabaseContracts/SearchModels/AbstractPersonSearchModel.cs
@@ -0,0 +1,9 @@
+namespace MedicalDatabaseContracts.SearchModels
+{
+    public class AbstractPersonSearchModel : AbstractSearchModel
+    {
+        public string? Name { get; set; }
+        public string? Surname { get; set; }
+        public string? Patronymic { get; set; }
+    }
+}
diff --git a/Medical/MedicalDatabaseContracts/SearchModels/DiagnoseSearchModel.cs b/Medical/MedicalDatabaseContracts/SearchModels/DiagnoseSearchModel.cs
new file mode 100644
index 0000000..c2afcff
--- /dev/null
+++ b/Medical/MedicalDatabaseContracts/SearchModels/DiagnoseSearchModel.cs
@@ -0,0 +1,4 @@
+namespace MedicalDatabaseContracts.SearchModels
+{
+    public class DiagnoseSearchModel : AbstractSearchModel { }
+}
diff --git a/Medical/MedicalDatabaseContracts/SearchModels/DoctorSearchModel.cs b/Medical/MedicalDatabaseContracts/SearchModels/DoctorSearchModel.cs
new file mode 100644
index 0000000..512a986
--- /dev/null
+++ b/Medical/MedicalDatabaseContracts/SearchModels/DoctorSearchModel.cs
@@ -0,0 +1,7 @@
+namespace MedicalDatabaseContracts.SearchModels
+{
+    public class DoctorSearchModel : AbstractPersonSearchModel
+    {
+        public int? SpecializationId { get; set; }
+    }
+}
diff --git a/Medical/MedicalDatabaseContracts/SearchModels/PatientSearchModel.cs b/Medical/MedicalDatabaseContracts/SearchModels/PatientSearchModel.cs
new file mode 100644
index 0000000..c0d6fee
--- /dev/null
+++ b/Medical/MedicalDatabaseContracts/SearchModels/PatientSearchModel.cs
@@ -0,0 +1,7 @@
+namespace MedicalDatabaseContracts.SearchModels
+{
+    public class PatientSearchModel : AbstractPersonSearchModel
+    {
+        public char? Gender { get; set; }
+    }
+}
diff --git a/Medical/MedicalDatabaseContracts/SearchModels/SpecializationSearchModel.cs b/Medical/MedicalDatabaseContracts/SearchModels/SpecializationSearchModel.cs
new file mode 100644
index 0000000..0553df9
--- /dev/null
+++ b/Medical/MedicalDatabaseContracts/SearchModels/SpecializationSearchModel.cs
@@ -0,0 +1,4 @@
+namespace MedicalDatabaseContracts.SearchModels
+{
+    public class SpecializationSearchModel : AbstractSearchModel { }
+}
diff --git a/Medical/MedicalDatabaseContracts/SearchModels/VisitSearchModel.cs b/Medical/MedicalDatabaseContracts/SearchModels/VisitSearchModel.cs
new file mode 100644
index 0000000..380b25e
--- /dev/null
+++ b/Medical/MedicalDatabaseContracts/SearchModels/VisitSearchModel.cs
@@ -0,0 +1,12 @@
+namespace MedicalDatabaseContracts.SearchModels
+{
+    public class VisitSearchModel : AbstractSearchModel
+    {
+        public DateOnly? DateFrom { get; set; }
+        public DateOnly? DateTo { get; set; }
+        public DateOnly? Date { get; set; }
+        public TimeOnly? TimeFrom { get; set; }
+        public TimeOnly? TimeTo { get; set; }
+        public TimeOnly? Time { get; set; }
+    }
+}
diff --git a/Medical/MedicalDatabaseContracts/ViewModels/AbstractPersonViewModel.cs b/Medical/MedicalDatabaseContracts/ViewModels/AbstractPersonViewModel.cs
index e6b4338..042ecb0 100644
--- a/Medical/MedicalDatabaseContracts/ViewModels/AbstractPersonViewModel.cs
+++ b/Medical/MedicalDatabaseContracts/ViewModels/AbstractPersonViewModel.cs
@@ -3,7 +3,7 @@ using System.ComponentModel;
 
 namespace MedicalDatabaseContracts.ViewModels
 {
-    public abstract class AbstractPersonViewModel : AbstractModel
+    public abstract class AbstractPersonViewModel : AbstractViewModel
     {
         [DisplayName("Имя")]
         public string Name { get; set; } = string.Empty;