diff --git a/Polyclinic/Polyclinic.sln b/Polyclinic/Polyclinic.sln
index b501ba1..5eac386 100644
--- a/Polyclinic/Polyclinic.sln
+++ b/Polyclinic/Polyclinic.sln
@@ -3,13 +3,15 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.9.34714.143
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PolyclinicView", "PolyclinicView\PolyclinicView.csproj", "{D45F3F15-39D7-416B-882F-517D479E8BBC}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PolyclinicView", "PolyclinicView\PolyclinicView.csproj", "{D45F3F15-39D7-416B-882F-517D479E8BBC}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PolyclinicDataModels", "PolyclinicDataModels\PolyclinicDataModels.csproj", "{4270CD59-76A0-4011-8A30-284FE5F75C26}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PolyclinicDataModels", "PolyclinicDataModels\PolyclinicDataModels.csproj", "{4270CD59-76A0-4011-8A30-284FE5F75C26}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PolyclinicContracts", "PolyclinicContracts\PolyclinicContracts.csproj", "{83EF9483-CD78-4C56-9848-C0A8325FEB41}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PolyclinicContracts", "PolyclinicContracts\PolyclinicContracts.csproj", "{83EF9483-CD78-4C56-9848-C0A8325FEB41}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PolyclinicDatabaseImplement", "PolyclinicDatabaseImplement\PolyclinicDatabaseImplement.csproj", "{E1C0ECAB-93C0-4364-B920-456F2CAA31C5}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PolyclinicDatabaseImplement", "PolyclinicDatabaseImplement\PolyclinicDatabaseImplement.csproj", "{E1C0ECAB-93C0-4364-B920-456F2CAA31C5}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PolyclinicBusinessLogic", "PolyclinicBusinessLogic\PolyclinicBusinessLogic.csproj", "{E3BCC45F-09E7-4E60-A662-8FAB01B25885}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -33,6 +35,10 @@ Global
 		{E1C0ECAB-93C0-4364-B920-456F2CAA31C5}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{E1C0ECAB-93C0-4364-B920-456F2CAA31C5}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{E1C0ECAB-93C0-4364-B920-456F2CAA31C5}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E3BCC45F-09E7-4E60-A662-8FAB01B25885}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E3BCC45F-09E7-4E60-A662-8FAB01B25885}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E3BCC45F-09E7-4E60-A662-8FAB01B25885}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E3BCC45F-09E7-4E60-A662-8FAB01B25885}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/CourseLogic.cs b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/CourseLogic.cs
new file mode 100644
index 0000000..d78f272
--- /dev/null
+++ b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/CourseLogic.cs
@@ -0,0 +1,105 @@
+using Microsoft.Extensions.Logging;
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.BusinessLogicsContracts;
+using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.StoragesContracts;
+using PolyclinicContracts.ViewModels;
+
+namespace PolyclinicBusinessLogic.BusinessLogics
+{
+    public class CourseLogic : ICourseLogic
+    {
+        private ILogger _logger;
+        private ICourseStorage _courseStorage;
+
+        public CourseLogic(ILogger logger, ICourseStorage courseStorage)
+        {
+            _logger = logger;
+            _courseStorage = courseStorage;
+        }
+
+        public bool Create(CourseBindingModel model)
+        {
+            CheckModel(model);
+            if (_courseStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(CourseBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_courseStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public CourseViewModel? ReadElement(CourseSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Id:{Id}", model.Id);
+            var element = _courseStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<CourseViewModel>? ReadList(CourseSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Id:{Id}", model?.Id);
+            var list = model == null ? _courseStorage.GetFullList() : _courseStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(CourseBindingModel model)
+        {
+            CheckModel(model);
+            if (_courseStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+        private void CheckModel(CourseBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (model.DaysCount < 1)
+            {
+                throw new ArgumentNullException("Количество дней приема должно быть больше нуля", nameof(model.DaysCount));
+            }
+            if (model.PillsPerDay < 1)
+            {
+                throw new ArgumentNullException("Количество препарата в день должно быть больше нуля", nameof(model.PillsPerDay));
+            }
+            _logger.LogInformation("Course. Id: {Id}", model.Id);
+        }
+    }
+}
diff --git a/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/DiagnoseLogic.cs b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/DiagnoseLogic.cs
new file mode 100644
index 0000000..d2d4e7b
--- /dev/null
+++ b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/DiagnoseLogic.cs
@@ -0,0 +1,109 @@
+using Microsoft.Extensions.Logging;
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.BusinessLogicsContracts;
+using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.StoragesContracts;
+using PolyclinicContracts.ViewModels;
+
+namespace PolyclinicBusinessLogic.BusinessLogics
+{
+    public class DiagnoseLogic : IDiagnoseLogic
+    {
+        private ILogger _logger;
+        private IDiagnoseStorage _diagnoseStorage;
+
+        public DiagnoseLogic(ILogger logger, IDiagnoseStorage diagnoseStorage)
+        {
+            _logger = logger;
+            _diagnoseStorage = diagnoseStorage;
+        }
+
+        public bool Create(DiagnoseBindingModel model)
+        {
+            CheckModel(model);
+            if (_diagnoseStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(DiagnoseBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Name:{Name}, Id:{Id}", model.Name, model.Id);
+            if (_diagnoseStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public DiagnoseViewModel? ReadElement(DiagnoseSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Name:{Name}, Id:{Id}, UserId:{UserId}", model.Name, model.Id, model.UserId);
+            var element = _diagnoseStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Name:{Name}, Id:{Id}, UserId:{UserId}", element.Name, element.Id, element.UserId);
+            return element;
+        }
+
+        public List<DiagnoseViewModel>? ReadList(DiagnoseSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Name:{Name} Id:{Id}, UserId:{UserId}", model?.Name, model?.Id, model?.UserId);
+            var list = model == null ? _diagnoseStorage.GetFullList() : _diagnoseStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(DiagnoseBindingModel model)
+        {
+            CheckModel(model);
+            if (_diagnoseStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+        private void CheckModel(DiagnoseBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Нет названия болезни", nameof(model.Name));
+            }
+            _logger.LogInformation("Diagnose. Name:{Name}. Id: {Id}", model.Name, model.Id);
+            var element = _diagnoseStorage.GetElement(new DiagnoseSearchModel
+            {
+                Name = model.Name
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Болезнь с таким названием уже есть");
+            }
+        }
+    }
+}
diff --git a/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/MedicamentLogic.cs b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/MedicamentLogic.cs
new file mode 100644
index 0000000..116abc8
--- /dev/null
+++ b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/MedicamentLogic.cs
@@ -0,0 +1,124 @@
+using Microsoft.Extensions.Logging;
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.BusinessLogicsContracts;
+using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.StoragesContracts;
+using PolyclinicContracts.ViewModels;
+
+namespace PolyclinicBusinessLogic.BusinessLogics
+{
+    public class MedicamentLogic : IMedicamentLogic
+    {
+        private readonly ILogger logger;
+        private readonly IMedicamentStorage medicamentStorage;
+
+        public MedicamentLogic(ILogger<MedicamentLogic> logger, IMedicamentStorage medicamentStorage)
+        {
+            this.logger = logger;
+            this.medicamentStorage = medicamentStorage;
+        }
+        public bool Create(MedicamentBindingModel model)
+        {
+            CheckModel(model);
+            if(medicamentStorage.Insert(model) == null)
+            {
+                logger.LogWarning("Create operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(MedicamentBindingModel model)
+        {
+            CheckModel(model, false);
+            if (medicamentStorage.Delete(model) == null)
+            {
+                logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            logger.LogInformation("Delete. Id:{Id}", model.Id);
+            return true;
+        }
+
+        public MedicamentViewModel? ReadElement(MedicamentSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            logger.LogInformation("ReadElement. MedicamentName:{Name}.Id:{ Id}", model.Name, model.Id);
+            var element = medicamentStorage.GetElement(model);
+            if (element == null)
+            {
+                logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<MedicamentViewModel>? ReadList(MedicamentSearchModel? model)
+        {
+            logger.LogInformation("ReadList. Name:{Name}. Id:{ Id}", model?.Name, model?.Id);
+            var list = model == null ? medicamentStorage.GetFullList() : medicamentStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(MedicamentBindingModel model)
+        {
+            CheckModel(model);
+            if (medicamentStorage.Update(model) == null)
+            {
+                logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(MedicamentBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (model.SymptomId <= 0)
+            {
+                throw new ArgumentNullException("Какой-то неправильный идентификатор симптома...", nameof(model));
+            }
+            if (model.ProcedureId <= 0)
+            {
+                throw new ArgumentNullException("Какой-то неправильный идентификатор процедуры...", nameof(model));
+            }
+            if (string.IsNullOrEmpty(model.Comment))
+            {
+                throw new ArgumentNullException("Нет комментария", nameof(model.Comment));
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Нет названия у препарата", nameof(model.Comment));
+            }
+
+            var element = medicamentStorage.GetElement(new MedicamentSearchModel
+            {
+                Name = model.Name
+            });
+
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Препарат с таким названием уже есть");
+            }
+
+            logger.LogInformation("Medicament. Comment:{Comment}. Id: { Id}", model.Comment, model.Id);
+        }
+    }
+}
diff --git a/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/ProcedureLogic.cs b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/ProcedureLogic.cs
new file mode 100644
index 0000000..789738b
--- /dev/null
+++ b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/ProcedureLogic.cs
@@ -0,0 +1,113 @@
+using Microsoft.Extensions.Logging;
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.BusinessLogicsContracts;
+using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.StoragesContracts;
+using PolyclinicContracts.ViewModels;
+
+namespace PolyclinicBusinessLogic.BusinessLogics
+{
+    public class ProcedureLogic : IProcedureLogic
+    {
+
+        private readonly ILogger logger;
+        private readonly IProcedureStorage procedureStorage;
+
+        public ProcedureLogic(ILogger<ProcedureLogic> logger, IProcedureStorage procedureStorage)
+        {
+            this.logger = logger;
+            this.procedureStorage = procedureStorage;
+        }
+        public bool Create(ProcedureBindingModel model)
+        {
+            CheckModel(model);
+            if (procedureStorage.Insert(model) == null)
+            {
+                logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(ProcedureBindingModel model)
+        {
+            CheckModel(model, false);
+
+            logger.LogInformation("Delete Id:{Id}", model.Id);
+            if(procedureStorage.Delete(model) == null)
+            {
+                logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public ProcedureViewModel? ReadElement(ProcedureSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            logger.LogInformation("ReadElement. ProcedureName:{ProcedureName}.Id:{ Id}", model.Name, model.Id);
+            var element = procedureStorage.GetElement(model);
+            if (element == null)
+            {
+                logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<ProcedureViewModel>? ReadList(ProcedureSearchModel? model)
+        {
+            logger.LogInformation("ReadList. Name:{Name}. Id:{ Id}", model?.Name, model?.Id);
+            var list = model == null ? procedureStorage.GetFullList() : procedureStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(ProcedureBindingModel model)
+        {
+            CheckModel(model);
+            if (procedureStorage.Update(model) == null)
+            {
+                logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(ProcedureBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Нет названия процедуры", nameof(model.Name));
+            }
+            logger.LogInformation("Procedure. Name:{Name}. Id: { Id}", model.Name, model.Id);
+
+            var element = procedureStorage.GetElement(new ProcedureSearchModel
+            {
+                Name = model.Name
+            });
+
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Процедура с таким названием уже есть");
+            }
+        }
+    }
+}
diff --git a/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/RecipeLogic.cs b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/RecipeLogic.cs
new file mode 100644
index 0000000..7f5c66c
--- /dev/null
+++ b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/RecipeLogic.cs
@@ -0,0 +1,106 @@
+using Microsoft.Extensions.Logging;
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.BusinessLogicsContracts;
+using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.StoragesContracts;
+using PolyclinicContracts.ViewModels;
+
+namespace PolyclinicBusinessLogic.BusinessLogics
+{
+    public class RecipeLogic : IRecipeLogic
+    {
+
+        private readonly ILogger logger;
+        private readonly IRecipeStorage recipeStorage;
+
+        public RecipeLogic(ILogger<RecipeLogic> logger, IRecipeStorage recipeStorage)
+        {
+            this.logger = logger;
+            this.recipeStorage = recipeStorage;
+        }
+        public bool Create(RecipeBindingModel model)
+        {
+            CheckModel(model);
+            if(recipeStorage.Insert(model) == null)
+            {
+                logger.LogWarning("Create operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(RecipeBindingModel model)
+        {
+            CheckModel(model, false);
+            if(recipeStorage.Delete(model) == null)
+            {
+                logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            logger.LogInformation("Delete Id:{Id}", model.Id);
+            return true;
+        }
+
+        public RecipeViewModel? ReadElement(RecipeSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            logger.LogInformation("ReadElement. Comment:{Comment}.Id:{ Id}", model.Comment, model.Id);
+            var element = recipeStorage.GetElement(model);
+            if (element == null)
+            {
+                logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<RecipeViewModel>? ReadList(RecipeSearchModel? model)
+        {
+            logger.LogInformation("ReadList. Comment:{Comment}. Id:{ Id}", model?.Comment, model?.Id);
+            var list = model == null ? recipeStorage.GetFullList() : recipeStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(RecipeBindingModel model)
+        {
+            CheckModel(model);
+            if(recipeStorage.Update(model) == null)
+            {
+                logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(RecipeBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if(model.ProceduresCount <= 0)
+            {
+                throw new ArgumentNullException("Количество процедур не может быть равно нулю или быть меньше нуля", nameof(model));
+            }
+            if (string.IsNullOrEmpty(model.Comment))
+            {
+                throw new ArgumentNullException("Нет комментария", nameof(model.Comment));
+            }
+            logger.LogInformation("Recipe. Comment:{Comment}. Id: { Id}", model.Comment, model.Id);
+        }
+    }
+}
diff --git a/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/SymptomLogic.cs b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/SymptomLogic.cs
new file mode 100644
index 0000000..e7f264f
--- /dev/null
+++ b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/SymptomLogic.cs
@@ -0,0 +1,109 @@
+using Microsoft.Extensions.Logging;
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.BusinessLogicsContracts;
+using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.StoragesContracts;
+using PolyclinicContracts.ViewModels;
+
+namespace PolyclinicBusinessLogic.BusinessLogics
+{
+    public class SymptomLogic : ISymptomLogic
+    {
+        private ILogger _logger;
+        private ISymptomStorage _symptomStorage;
+
+        public SymptomLogic(ILogger logger, ISymptomStorage symptomStorage)
+        {
+            _logger = logger;
+            _symptomStorage = symptomStorage;
+        }
+
+        public bool Create(SymptomBindingModel model)
+        {
+            CheckModel(model);
+            if (_symptomStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(SymptomBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Name:{Name}, Id:{Id}", model.Name, model.Id);
+            if (_symptomStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public SymptomViewModel? ReadElement(SymptomSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Name:{Name}, Id:{Id}", model.Name, model.Id);
+            var element = _symptomStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Name:{Name}, Id:{Id}", element.Name, element.Id);
+            return element;
+        }
+
+        public List<SymptomViewModel>? ReadList(SymptomSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Name:{Name} Id:{Id}", model?.Name, model?.Id);
+            var list = model == null ? _symptomStorage.GetFullList() : _symptomStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(SymptomBindingModel model)
+        {
+            CheckModel(model);
+            if (_symptomStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+        private void CheckModel(SymptomBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Нет названия симптома", nameof(model.Name));
+            }
+            _logger.LogInformation("Symptom. Name:{Name}. Id: {Id}", model.Name, model.Id);
+            var element = _symptomStorage.GetElement(new SymptomSearchModel
+            {
+                Name = model.Name
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Симптом с таким названием уже есть");
+            }
+        }
+    }
+}
diff --git a/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/UserLogic.cs b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/UserLogic.cs
new file mode 100644
index 0000000..735bb03
--- /dev/null
+++ b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/UserLogic.cs
@@ -0,0 +1,117 @@
+using Microsoft.Extensions.Logging;
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.BusinessLogicsContracts;
+using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.StoragesContracts;
+using PolyclinicContracts.ViewModels;
+
+namespace PolyclinicBusinessLogic.BusinessLogics
+{
+    public class UserLogic : IUserLogic
+    {
+        private ILogger _logger;
+        private IUserStorage _userStorage;
+
+        public UserLogic(ILogger logger, IUserStorage userStorage)
+        {
+            _logger = logger;
+            _userStorage = userStorage;
+        }
+
+        public bool Create(UserBindingModel model)
+        {
+            CheckModel(model);
+            if (_userStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(UserBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_userStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public UserViewModel? ReadElement(UserSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Email:{Email}. Id:{Id}", model.Email, model.Id);
+            var element = _userStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<UserViewModel>? ReadList(UserSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Email:{Email}. Id:{Id}", model?.Email, model?.Id);
+            var list = model == null ? _userStorage.GetFullList() : _userStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(UserBindingModel model)
+        {
+            CheckModel(model);
+            if (_userStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+        private void CheckModel(UserBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Email))
+            {
+                throw new ArgumentNullException("Нет email пользователя", nameof(model.Email));
+            }
+            if (string.IsNullOrEmpty(model.Password))
+            {
+                throw new ArgumentNullException("Нет пароля пользователя", nameof(model.Password));
+            }
+            if (string.IsNullOrEmpty(model.FIO))
+            {
+                throw new ArgumentNullException("Нет фио пользователя", nameof(model.FIO));
+            }
+            _logger.LogInformation("User. Email:{Email}. Id: {Id}", model.Email, model.Id);
+            var element = _userStorage.GetElement(new UserSearchModel
+            {
+                Email = model.Email
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Пользователь с таким email уже есть");
+            }
+        }
+    }
+}
diff --git a/Polyclinic/PolyclinicBusinessLogic/PolyclinicBusinessLogic.csproj b/Polyclinic/PolyclinicBusinessLogic/PolyclinicBusinessLogic.csproj
new file mode 100644
index 0000000..329c997
--- /dev/null
+++ b/Polyclinic/PolyclinicBusinessLogic/PolyclinicBusinessLogic.csproj
@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="7.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PolyclinicContracts\PolyclinicContracts.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/Polyclinic/PolyclinicContracts/SearchModels/DiagnoseSearchModel.cs b/Polyclinic/PolyclinicContracts/SearchModels/DiagnoseSearchModel.cs
index da88efa..cc2711c 100644
--- a/Polyclinic/PolyclinicContracts/SearchModels/DiagnoseSearchModel.cs
+++ b/Polyclinic/PolyclinicContracts/SearchModels/DiagnoseSearchModel.cs
@@ -3,6 +3,7 @@
     public class DiagnoseSearchModel
     {
         public int? Id { get; set; }
+        public string? Name { get; set; }
         public int? UserId { get; set; }
     }
 }
diff --git a/Polyclinic/PolyclinicContracts/SearchModels/SymptomSearchModel.cs b/Polyclinic/PolyclinicContracts/SearchModels/SymptomSearchModel.cs
index 156f028..8131037 100644
--- a/Polyclinic/PolyclinicContracts/SearchModels/SymptomSearchModel.cs
+++ b/Polyclinic/PolyclinicContracts/SearchModels/SymptomSearchModel.cs
@@ -3,5 +3,6 @@
     public class SymptomSearchModel
     {
         public int? Id { get; set; }
+        public string?Name { get; set; }
     }
 }