diff --git a/Extensions/Xtensive.Orm.Tracking/TrackingCompletedEventArgs.cs b/Extensions/Xtensive.Orm.Tracking/TrackingCompletedEventArgs.cs
index c53101c1d1..6686e9a650 100644
--- a/Extensions/Xtensive.Orm.Tracking/TrackingCompletedEventArgs.cs
+++ b/Extensions/Xtensive.Orm.Tracking/TrackingCompletedEventArgs.cs
@@ -13,7 +13,7 @@ namespace Xtensive.Orm.Tracking
   public readonly struct TrackingCompletedEventArgs
   {
     /// <summary>
-    /// Gets session this changes occured in.
+    /// Gets session this changes occurred in.
     /// </summary>
     public Session Session { get; }
 
diff --git a/Orm/Xtensive.Orm.SqlServer/Sql.Drivers.SqlServer/InternalHelpers.cs b/Orm/Xtensive.Orm.SqlServer/Sql.Drivers.SqlServer/InternalHelpers.cs
index bc767a3c27..4cdb6d094d 100644
--- a/Orm/Xtensive.Orm.SqlServer/Sql.Drivers.SqlServer/InternalHelpers.cs
+++ b/Orm/Xtensive.Orm.SqlServer/Sql.Drivers.SqlServer/InternalHelpers.cs
@@ -123,7 +123,7 @@ public static bool ShouldRetryOn(Exception ex)
             // The instance of SQL Server you attempted to connect to does not support encryption.
             case 20:
               return true;
-              // This exception can be thrown even if the operation completed succesfully, so it's safer to let the application fail.
+              // This exception can be thrown even if the operation completed successfully, so it's safer to let the application fail.
               // DBNETLIB Error Code: -2
               // Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated.
               //case -2:
diff --git a/Orm/Xtensive.Orm.Tests/Issues/IssueJira0222_GroupByBooleanColumn.cs b/Orm/Xtensive.Orm.Tests/Issues/IssueJira0222_GroupByBooleanColumn.cs
index bd74201045..4a13d933bc 100644
--- a/Orm/Xtensive.Orm.Tests/Issues/IssueJira0222_GroupByBooleanColumn.cs
+++ b/Orm/Xtensive.Orm.Tests/Issues/IssueJira0222_GroupByBooleanColumn.cs
@@ -18,7 +18,7 @@ public class Message : Entity
     public int Id { get; private set; }
 
     [Field]
-    public bool IsRecieved { get; set; }
+    public bool IsReceived { get; set; }
   }
 }
 
@@ -38,18 +38,18 @@ public void MainTest()
     {
       using (Domain.OpenSession()) {
         using (var t = Session.Current.OpenTransaction()) {
-          new Message {IsRecieved = true};
-          new Message {IsRecieved = true};
-          new Message {IsRecieved = false};
+          new Message {IsReceived = true};
+          new Message {IsReceived = true};
+          new Message {IsReceived = false};
 
           var result = Query.All<Message>()
-            .GroupBy(m => m.IsRecieved)
+            .GroupBy(m => m.IsReceived)
             .OrderBy(g => g.Key)
-            .Select(g => new {IsRecieved = g.Key, Count = g.Count()})
+            .Select(g => new {IsReceived = g.Key, Count = g.Count()})
             .ToList();
 
-          var trueResult = result.Single(item => item.IsRecieved).Count;
-          var falseResult = result.Single(item => !item.IsRecieved).Count;
+          var trueResult = result.Single(item => item.IsReceived).Count;
+          var falseResult = result.Single(item => !item.IsReceived).Count;
 
           Assert.AreEqual(2, trueResult);
           Assert.AreEqual(1, falseResult);
diff --git a/Orm/Xtensive.Orm/Orm/Exceptions/ConnectionErrorException.cs b/Orm/Xtensive.Orm/Orm/Exceptions/ConnectionErrorException.cs
index fbd20ed55a..d35c2991d8 100644
--- a/Orm/Xtensive.Orm/Orm/Exceptions/ConnectionErrorException.cs
+++ b/Orm/Xtensive.Orm/Orm/Exceptions/ConnectionErrorException.cs
@@ -11,7 +11,7 @@
 namespace Xtensive.Orm
 {
   /// <summary>
-  /// An exception that is thrown when a connection error occured.
+  /// An exception that is thrown when a connection error occurred.
   /// </summary>
   [Serializable]
   public sealed class ConnectionErrorException : StorageException
diff --git a/Orm/Xtensive.Orm/Orm/Exceptions/StorageExceptionInfo.cs b/Orm/Xtensive.Orm/Orm/Exceptions/StorageExceptionInfo.cs
index 4879b0d990..6b85cf8502 100644
--- a/Orm/Xtensive.Orm/Orm/Exceptions/StorageExceptionInfo.cs
+++ b/Orm/Xtensive.Orm/Orm/Exceptions/StorageExceptionInfo.cs
@@ -20,11 +20,11 @@ namespace Xtensive.Orm
   public class StorageExceptionInfo
   {
     /// <summary>
-    /// Type in which error occured (if any).
+    /// Type in which error occurred (if any).
     /// </summary>
     public TypeInfo Type { get; private set; }
     /// <summary>
-    /// Field in which error occured (if any).
+    /// Field in which error occurred (if any).
     /// </summary>
     public FieldInfo Field { get; private set; }
     /// <summary>
diff --git a/Orm/Xtensive.Orm/Orm/Session.Validation.cs b/Orm/Xtensive.Orm/Orm/Session.Validation.cs
index 0e6cf49708..0a4473dc06 100644
--- a/Orm/Xtensive.Orm/Orm/Session.Validation.cs
+++ b/Orm/Xtensive.Orm/Orm/Session.Validation.cs
@@ -28,7 +28,7 @@ public partial class Session
     /// Validates all registered entities similar to <see cref="Validate"/> method
     /// and returns all validation errors.
     /// </summary>
-    /// <returns>List errors occured during validation.</returns>
+    /// <returns>List errors occurred during validation.</returns>
     public IList<EntityErrorInfo> ValidateAndGetErrors() => ValidationContext.ValidateAndGetErrors();
   }
 }
\ No newline at end of file
diff --git a/Orm/Xtensive.Orm/Strings.Designer.cs b/Orm/Xtensive.Orm/Strings.Designer.cs
index 284d869e30..bca638090a 100644
--- a/Orm/Xtensive.Orm/Strings.Designer.cs
+++ b/Orm/Xtensive.Orm/Strings.Designer.cs
@@ -7076,11 +7076,11 @@ internal static string SqlErrorDetailsX {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to SQL error occured..
+        ///   Looks up a localized string similar to SQL error occurred..
         /// </summary>
         internal static string SqlErrorOccured {
             get {
-                return ResourceManager.GetString("SqlErrorOccured", resourceCulture);
+                return ResourceManager.GetString("SqlErrorOccurred", resourceCulture);
             }
         }
         
diff --git a/Orm/Xtensive.Orm/Strings.resx b/Orm/Xtensive.Orm/Strings.resx
index 730c44a495..0581d90422 100644
--- a/Orm/Xtensive.Orm/Strings.resx
+++ b/Orm/Xtensive.Orm/Strings.resx
@@ -681,8 +681,8 @@
   <data name="ExSequenceXIsNotFoundInStorage" xml:space="preserve">
     <value>Sequence '{0}' is not found in storage.</value>
   </data>
-  <data name="SqlErrorOccured" xml:space="preserve">
-    <value>SQL error occured.</value>
+  <data name="SqlErrorOccurred" xml:space="preserve">
+    <value>SQL error occurred.</value>
   </data>
   <data name="StorageErrorDetailsX" xml:space="preserve">
     <value>Storage error details '{0}'</value>