diff --git a/Aaru.CommonTypes.csproj b/Aaru.CommonTypes.csproj
index b9c9d85..44835dc 100644
--- a/Aaru.CommonTypes.csproj
+++ b/Aaru.CommonTypes.csproj
@@ -60,6 +60,7 @@
     <Compile Include="..\CICMMetadata\dotnet\cicm.cs">
       <Link>Metadata/cicm.cs</Link>
     </Compile>
+    <Compile Include="Delegates.cs" />
     <Compile Include="Enums\DeviceType.cs" />
     <Compile Include="Enums\ErrorNumber.cs" />
     <Compile Include="Enums\Images.cs" />
@@ -127,7 +128,7 @@
     <PackageReference Include="System.ComponentModel.Annotations" Version="4.7.0" />
     <PackageReference Include="System.Security.Principal.Windows" Version="4.7.0" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
-    <PackageReference Include="Unclassified.NetRevisionTask" Version="0.3.0" PrivateAssets="all"/>
+    <PackageReference Include="Unclassified.NetRevisionTask" Version="0.3.0" PrivateAssets="all" />
   </ItemGroup>
   <ItemGroup>
     <Content Include="..\LICENSE.MIT">
diff --git a/Delegates.cs b/Delegates.cs
new file mode 100644
index 0000000..376c6cd
--- /dev/null
+++ b/Delegates.cs
@@ -0,0 +1,88 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : Delegates.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Common types.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Delegates to communicate with user interface.
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This program is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as
+//     published by the Free Software Foundation, either version 3 of the
+//     License, or (at your option) any later version.
+//
+//     This program is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+//
+//     You should have received a copy of the GNU General Public License
+//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2011-2020 Natalia Portillo
+// ****************************************************************************/
+
+namespace Aaru.CommonTypes
+{
+    /// <summary>Initializes a progress indicator (e.g. makes a progress bar visible)</summary>
+    public delegate void InitProgressHandler();
+
+    /// <summary>Updates a progress indicator with text</summary>
+    public delegate void UpdateProgressHandler(string text, long current, long maximum);
+
+    /// <summary>Pulses a progress indicator with indeterminate boundaries</summary>
+    public delegate void PulseProgressHandler(string text);
+
+    /// <summary>Uninitializes a progress indicator (e.g. adds a newline to the console)</summary>
+    public delegate void EndProgressHandler();
+
+    /// <summary>Initializes a secondary progress indicator (e.g. makes a progress bar visible)</summary>
+    public delegate void InitProgressHandler2();
+
+    /// <summary>Updates a secondary progress indicator with text</summary>
+    public delegate void UpdateProgressHandler2(string text, long current, long maximum);
+
+    /// <summary>Pulses a secondary progress indicator with indeterminate boundaries</summary>
+    public delegate void PulseProgressHandler2(string text);
+
+    /// <summary>Uninitializes a secondary progress indicator (e.g. adds a newline to the console)</summary>
+    public delegate void EndProgressHandler2();
+
+    /// <summary>Initializes two progress indicators (e.g. makes a progress bar visible)</summary>
+    public delegate void InitTwoProgressHandler();
+
+    /// <summary>Updates two progress indicators with text</summary>
+    public delegate void UpdateTwoProgressHandler(string text, long current, long maximum, string text2, long current2,
+                                                  long maximum2);
+
+    /// <summary>Pulses a progress indicator with indeterminate boundaries</summary>
+    public delegate void PulseTwoProgressHandler(string text, string text2);
+
+    /// <summary>Uninitializes a progress indicator (e.g. adds a newline to the console)</summary>
+    public delegate void EndTwoProgressHandler();
+
+    /// <summary>Updates a status indicator</summary>
+    public delegate void UpdateStatusHandler(string text);
+
+    /// <summary>Shows an error message</summary>
+    public delegate void ErrorMessageHandler(string text);
+
+    public delegate void InitBlockMapHandler(ulong blocks, ulong blockSize, ulong blocksToRead, ushort currentProfile);
+
+    /// <summary>Updates lists of time taken on scanning from the specified sector</summary>
+    /// <param name="duration">Time in milliseconds</param>
+    public delegate void ScanTimeHandler(ulong sector, double duration);
+
+    /// <summary>Specified a number of blocks could not be read on scan</summary>
+    public delegate void ScanUnreadableHandler(ulong sector);
+
+    public delegate void ScanSpeedHandler(ulong sector, double currentSpeed);
+}
\ No newline at end of file