diff --git a/Back/skydiveLogs-api.DomainBusiness/JumpTypeService.cs b/Back/skydiveLogs-api.DomainBusiness/JumpTypeService.cs
index ca4329c..63bd568 100644
--- a/Back/skydiveLogs-api.DomainBusiness/JumpTypeService.cs
+++ b/Back/skydiveLogs-api.DomainBusiness/JumpTypeService.cs
@@ -22,17 +22,29 @@ namespace skydiveLogs_api.DomainBusiness
 
         #region Public Methods
 
+        /// <summary>
+        /// Adds a new jump type to the system.
+        /// </summary>
+        /// <param name="newJumpType">The JumpType entity containing the new jump type data.</param>
         public void AddNewJumpType(JumpType newJumpType)
         {
             _jumpTypeRepository.Add(newJumpType);
             _cacheService.Delete(CacheType.JumpType);
         }
 
+        /// <summary>
+        /// Deletes a jump type by its ID.
+        /// </summary>
+        /// <param name="id">The jump type ID to delete.</param>
         public void DeleteJumpTypeById(int id)
         {
             throw new NotImplementedException();
         }
 
+        /// <summary>
+        /// Retrieves all jump types.
+        /// </summary>
+        /// <returns>A collection of JumpType entities containing all jump types.</returns>
         public IEnumerable<JumpType> GetAllJumpTypes()
         {
             if (!_cacheService.Contains(CacheType.JumpType))
@@ -43,17 +55,33 @@ namespace skydiveLogs_api.DomainBusiness
             return _cacheService.Get<IEnumerable<JumpType>>(CacheType.JumpType);
         }
 
+        /// <summary>
+        /// Retrieves jump types specifically used for tunnel operations.
+        /// </summary>
+        /// <returns>A collection of JumpType entities containing tunnel jump types.</returns>
         public IEnumerable<JumpType> GetJumpTypesForTunnel()
         {
             return GetAllJumpTypes().Where(t => t.InTunnel);
         }
 
+        /// <summary>
+        /// Retrieves a jump type by its ID.
+        /// </summary>
+        /// <param name="id">The jump type ID to retrieve.</param>
+        /// <returns>A JumpType entity containing the jump type details.</returns>
         public JumpType GetJumpTypeById(int id)
         {
             var allJumpTypes = GetAllJumpTypes();
             return allJumpTypes.Single(g => g.Id == id);
         }
 
+        /// <summary>
+        /// Updates an existing jump type.
+        /// </summary>
+        /// <param name="id">The jump type ID to update.</param>
+        /// <param name="jumpType">JumpType entity containing the updated jump type data.</param>
+        /// <param name="resetCache">Whether to reset the cache after update.</param>
+        /// <returns>True if the update was successful, false otherwise.</returns>
         public bool UpdateJumpType(int id, JumpType jumpType, bool resetCache = true)
         {
             jumpType.Id = id;
@@ -74,4 +102,4 @@ namespace skydiveLogs_api.DomainBusiness
 
         #endregion Private Fields
     }
-}
\ No newline at end of file
+}
diff --git a/Back/skydiveLogs-api.DomainBusiness/StatsByAircraftService.cs b/Back/skydiveLogs-api.DomainBusiness/StatsByAircraftService.cs
index 2815abd..3bf4a27 100644
--- a/Back/skydiveLogs-api.DomainBusiness/StatsByAircraftService.cs
+++ b/Back/skydiveLogs-api.DomainBusiness/StatsByAircraftService.cs
@@ -1,8 +1,8 @@
-using skydiveLogs_api.Domain;
+using System.Collections.Generic;
+using System.Linq;
+using skydiveLogs_api.Domain;
 using skydiveLogs_api.DomainBusiness.Interfaces;
 using skydiveLogs_api.DomainService.Repositories;
-using System.Collections.Generic;
-using System.Linq;
 
 namespace skydiveLogs_api.DomainBusiness
 {
@@ -23,6 +23,10 @@ namespace skydiveLogs_api.DomainBusiness
 
         #region Public Methods
 
+        /// <summary>
+        /// Retrieves statistics grouped by aircraft.
+        /// </summary>
+        /// <returns>A collection of StatsByAircraft entities containing the statistics.</returns>
         public IEnumerable<StatsByAircraft> GetStats()
         {
             var allStats = _statsByAircraftRepository.GetAll(_identityService.ConnectedUser);
@@ -50,6 +54,9 @@ namespace skydiveLogs_api.DomainBusiness
             return allStats;
         }
 
+        /// <summary>
+        /// Resets the aircraft statistics.
+        /// </summary>
         public void Reset()
         {
             _statsByAircraftRepository.Delete(_identityService.ConnectedUser);
@@ -65,4 +72,4 @@ namespace skydiveLogs_api.DomainBusiness
 
         #endregion Private Fields
     }
-}
\ No newline at end of file
+}
diff --git a/Back/skydiveLogs-api.DomainBusiness/StatsByDzService.cs b/Back/skydiveLogs-api.DomainBusiness/StatsByDzService.cs
index c8046b4..bafac32 100644
--- a/Back/skydiveLogs-api.DomainBusiness/StatsByDzService.cs
+++ b/Back/skydiveLogs-api.DomainBusiness/StatsByDzService.cs
@@ -1,8 +1,8 @@
-using skydiveLogs_api.Domain;
+using System.Collections.Generic;
+using System.Linq;
+using skydiveLogs_api.Domain;
 using skydiveLogs_api.DomainBusiness.Interfaces;
 using skydiveLogs_api.DomainService.Repositories;
-using System.Collections.Generic;
-using System.Linq;
 
 namespace skydiveLogs_api.DomainBusiness
 {
@@ -23,6 +23,10 @@ namespace skydiveLogs_api.DomainBusiness
 
         #region Public Methods
 
+        /// <summary>
+        /// Retrieves statistics grouped by drop zone.
+        /// </summary>
+        /// <returns>A collection of StatsByDz entities containing the statistics.</returns>
         public IEnumerable<StatsByDz> GetStats()
         {
             var allStats = _statsByDzRepository.GetAll(_identityService.ConnectedUser);
@@ -50,6 +54,9 @@ namespace skydiveLogs_api.DomainBusiness
             return allStats;
         }
 
+        /// <summary>
+        /// Resets the drop zone statistics.
+        /// </summary>
         public void Reset()
         {
             _statsByDzRepository.Delete(_identityService.ConnectedUser);
@@ -65,4 +72,4 @@ namespace skydiveLogs_api.DomainBusiness
 
         #endregion Private Fields
     }
-}
\ No newline at end of file
+}
diff --git a/Back/skydiveLogs-api.DomainBusiness/StatsByGearService.cs b/Back/skydiveLogs-api.DomainBusiness/StatsByGearService.cs
index 90d045c..7ff5447 100644
--- a/Back/skydiveLogs-api.DomainBusiness/StatsByGearService.cs
+++ b/Back/skydiveLogs-api.DomainBusiness/StatsByGearService.cs
@@ -1,8 +1,8 @@
-using skydiveLogs_api.Domain;
+using System.Collections.Generic;
+using System.Linq;
+using skydiveLogs_api.Domain;
 using skydiveLogs_api.DomainBusiness.Interfaces;
 using skydiveLogs_api.DomainService.Repositories;
-using System.Collections.Generic;
-using System.Linq;
 
 namespace skydiveLogs_api.DomainBusiness
 {
@@ -23,6 +23,10 @@ namespace skydiveLogs_api.DomainBusiness
 
         #region Public Methods
 
+        /// <summary>
+        /// Retrieves statistics grouped by gear.
+        /// </summary>
+        /// <returns>A collection of StatsByGear entities containing the statistics.</returns>
         public IEnumerable<StatsByGear> GetStats()
         {
             var allStats = _statsByGearRepository.GetAll(_identityService.ConnectedUser);
@@ -50,6 +54,9 @@ namespace skydiveLogs_api.DomainBusiness
             return allStats;
         }
 
+        /// <summary>
+        /// Resets the gear statistics.
+        /// </summary>
         public void Reset()
         {
             _statsByGearRepository.Delete(_identityService.ConnectedUser);
@@ -65,4 +72,4 @@ namespace skydiveLogs_api.DomainBusiness
 
         #endregion Private Fields
     }
-}
\ No newline at end of file
+}
diff --git a/Back/skydiveLogs-api.DomainBusiness/StatsByJumpTypeService.cs b/Back/skydiveLogs-api.DomainBusiness/StatsByJumpTypeService.cs
index 831016e..42121ce 100644
--- a/Back/skydiveLogs-api.DomainBusiness/StatsByJumpTypeService.cs
+++ b/Back/skydiveLogs-api.DomainBusiness/StatsByJumpTypeService.cs
@@ -23,6 +23,10 @@ namespace skydiveLogs_api.DomainBusiness
 
         #region Public Methods
 
+        /// <summary>
+        /// Retrieves statistics grouped by jump type.
+        /// </summary>
+        /// <returns>A collection of StatsByJumpType entities containing the statistics.</returns>
         public IEnumerable<StatsByJumpType> GetStats()
         {
             var allStats = _statsByJumpTypeRepository.GetAll(_identityService.ConnectedUser);
@@ -50,6 +54,9 @@ namespace skydiveLogs_api.DomainBusiness
             return allStats;
         }
 
+        /// <summary>
+        /// Resets the year and jump type statistics.
+        /// </summary>
         public void Reset()
         {
             _statsByJumpTypeRepository.Delete(_identityService.ConnectedUser);
@@ -65,4 +72,4 @@ namespace skydiveLogs_api.DomainBusiness
 
         #endregion Private Fields
     }
-}
\ No newline at end of file
+}
diff --git a/Back/skydiveLogs-api.DomainBusiness/StatsByYearByJumpTypeService.cs b/Back/skydiveLogs-api.DomainBusiness/StatsByYearByJumpTypeService.cs
index 1920469..872e0d0 100644
--- a/Back/skydiveLogs-api.DomainBusiness/StatsByYearByJumpTypeService.cs
+++ b/Back/skydiveLogs-api.DomainBusiness/StatsByYearByJumpTypeService.cs
@@ -23,6 +23,10 @@ namespace skydiveLogs_api.DomainBusiness
 
         #region Public Methods
 
+        /// <summary>
+        /// Retrieves statistics grouped by year and jump type.
+        /// </summary>
+        /// <returns>A collection of StatsByYearByJumpType entities containing the statistics.</returns>
         public IEnumerable<StatsByYearByJumpType> GetStats()
         {
             var allStats = _statsByYearByJumpTypeRepository.GetAll(_identityService.ConnectedUser);
@@ -51,6 +55,9 @@ namespace skydiveLogs_api.DomainBusiness
             return allStats;
         }
 
+        /// <summary>
+        /// Resets the last year by jump type statistics.
+        /// </summary>
         public void Reset()
         {
             _statsByYearByJumpTypeRepository.Delete(_identityService.ConnectedUser);
@@ -66,4 +73,4 @@ namespace skydiveLogs_api.DomainBusiness
 
         #endregion Private Fields
     }
-}
\ No newline at end of file
+}
diff --git a/Back/skydiveLogs-api.DomainBusiness/TunnelService.cs b/Back/skydiveLogs-api.DomainBusiness/TunnelService.cs
index da89339..80cebed 100644
--- a/Back/skydiveLogs-api.DomainBusiness/TunnelService.cs
+++ b/Back/skydiveLogs-api.DomainBusiness/TunnelService.cs
@@ -24,11 +24,20 @@ namespace skydiveLogs_api.DomainBusiness
 
         #region Public Methods
 
+        /// <summary>
+        /// Retrieves all tunnels.
+        /// </summary>
+        /// <returns>A collection of Tunnel entities containing all tunnels.</returns>
         public IEnumerable<Tunnel> GetAllTunnels()
         {
             return GetAllRefTunnels();
         }
 
+        /// <summary>
+        /// Retrieves a tunnel by its ID.
+        /// </summary>
+        /// <param name="id">The tunnel ID to retrieve.</param>
+        /// <returns>A Tunnel entity containing the tunnel details.</returns>
         public Tunnel GetTunnelById(int id)
         {
             var allTunnels = GetAllRefTunnels();
@@ -70,4 +79,4 @@ namespace skydiveLogs_api.DomainBusiness
 
         #endregion Private Fields
     }
-}
\ No newline at end of file
+}