diff --git a/src/GraphingInterfaces/GraphingEnums.h b/src/GraphingInterfaces/GraphingEnums.h
index 0686d74..47139ad 100644
--- a/src/GraphingInterfaces/GraphingEnums.h
+++ b/src/GraphingInterfaces/GraphingEnums.h
@@ -326,18 +326,24 @@ namespace Graphing
             //   Zoom out on all axes by the predefined ratio
             ZoomOut,
 
-            //   Zoom out on X axis only, leave the range of Y unchanged
+            //   Zoom out on X axis only, leave the range of Y (and Z in 3D) unchanged
             WidenX,
 
-            //   Zoom in on X axis only, leave the range of Y unchanged
+            //   Zoom in on X axis only, leave the range of Y (and Z in 3D) unchanged
             ShrinkX,
 
-            //   Zoom out on Y axis only, leave the range of X unchanged
+            //   Zoom out on Y axis only, leave the range of X (and Z in 3D) unchanged
             WidenY,
 
-            //   Zoom in on Y axis only, leave the range of X unchanged
+            //   Zoom in on Y axis only, leave the range of X (and Z in 3D) unchanged
             ShrinkY,
 
+            //   Zoom out on Z axis only, leave the range of X and Y unchanged. Apply to 3D graph only but not 2D graph.
+            WidenZ,
+
+            //   Zoom in on Z axis only, leave the range of X and Y unchanged. Apply to 3D graph only but not 2D graph.
+            ShrinkZ,
+
             //   Move the view window of the graph towards the negative X axis.
             MoveNegativeX,
 
@@ -350,6 +356,12 @@ namespace Graphing
             //   Move the view window of the graph towards the positive Y axis.
             MovePositiveY,
 
+            //   Move the view window of the graph towards the negative Z axis.
+            MoveNegativeZ,
+
+            //   Move the view window of the graph towards the positive Z axis.
+            MovePositiveZ,
+
             //   Zoom in on all axes by the predefined ratio. The ratio is smaller than used in ZoomIn result in a smoother motion
             SmoothZoomIn,
 
diff --git a/src/GraphingInterfaces/IEquation.h b/src/GraphingInterfaces/IEquation.h
new file mode 100644
index 0000000..f49a0f9
--- /dev/null
+++ b/src/GraphingInterfaces/IEquation.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include "Common.h"
+#include "IEquationOptions.h"
+
+namespace Graphing
+{
+    struct IEquation : public NonCopyable, public NonMoveable
+    {
+        virtual ~IEquation() = default;
+
+        virtual std::shared_ptr<IEquationOptions> GetGraphEquationOptions() const = 0;
+
+        virtual unsigned int GetGraphEquationID() const = 0;
+
+        virtual bool TrySelectEquation() = 0;
+        virtual bool IsEquationSelected() const = 0;
+    };
+}
\ No newline at end of file
diff --git a/src/GraphingInterfaces/IEquationOptions.h b/src/GraphingInterfaces/IEquationOptions.h
new file mode 100644
index 0000000..1bdd073
--- /dev/null
+++ b/src/GraphingInterfaces/IEquationOptions.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "Common.h"
+#include "GraphingEnums.h"
+
+namespace Graphing
+{
+    struct IEquationOptions : public NonCopyable, public NonMoveable
+    {
+        virtual ~IEquationOptions() = default;
+
+        virtual Graphing::Color GetGraphColor() const = 0;
+        virtual void SetGraphColor(const Graphing::Color& color) = 0;
+        virtual void ResetGraphColor() = 0;
+
+        virtual Graphing::Renderer::LineStyle GetLineStyle() const = 0;
+        virtual void SetLineStyle(Graphing::Renderer::LineStyle value) = 0;
+        virtual void ResetLineStyle() = 0;
+
+        virtual float GetLineWidth() const = 0;
+        virtual void SetLineWidth(float value) = 0;
+        virtual void ResetLineWidth() = 0;
+
+        virtual float GetSelectedEquationLineWidth() const = 0;
+        virtual void SetSelectedEquationLineWidth(float value) = 0;
+        virtual void ResetSelectedEquationLineWidth() = 0;
+
+        virtual float GetPointRadius() const = 0;
+        virtual void SetPointRadius(float value) = 0;
+        virtual void ResetPointRadius() = 0;
+
+        virtual float GetSelectedEquationPointRadius() const = 0;
+        virtual void SetSelectedEquationPointRadius(float value) = 0;
+        virtual void ResetSelectedEquationPointRadius() = 0;
+    };
+}
\ No newline at end of file
diff --git a/src/GraphingInterfaces/IGraph.h b/src/GraphingInterfaces/IGraph.h
index 65322d9..9cabaf7 100644
--- a/src/GraphingInterfaces/IGraph.h
+++ b/src/GraphingInterfaces/IGraph.h
@@ -3,6 +3,8 @@
 #include "Common.h"
 #include "IGraphingOptions.h"
 #include "IGraphRenderer.h"
+#include "IEquation.h"
+#include <optional>
 
 namespace Graphing
 {
@@ -10,10 +12,12 @@ namespace Graphing
     {
         virtual ~IGraph() = default;
 
-        virtual bool TryInitialize(const IExpression* graphingExp) = 0;
+        virtual std::optional<std::vector<std::shared_ptr<IEquation>>> TryInitialize(const IExpression* graphingExp) = 0;
 
         virtual IGraphingOptions& GetOptions() = 0;
 
         virtual std::shared_ptr< Renderer::IGraphRenderer > GetRenderer() const = 0;
+
+        virtual bool TryResetSelection() = 0;
     };
 }
diff --git a/src/GraphingInterfaces/IGraphRenderer.h b/src/GraphingInterfaces/IGraphRenderer.h
index 85af9fe..ce72d86 100644
--- a/src/GraphingInterfaces/IGraphRenderer.h
+++ b/src/GraphingInterfaces/IGraphRenderer.h
@@ -16,7 +16,7 @@ namespace Graphing::Renderer
 
         virtual HRESULT DrawD2D1(ID2D1Factory* pDirect2dFactory, ID2D1RenderTarget* pRenderTarget, bool& hasSomeMissingDataOut) = 0;
         virtual HRESULT GetClosePointData(float inScreenPointX, float inScreenPointY, int& formulaIdOut, float& xScreenPointOut, float& yScreenPointOut, float& xValueOut, float& yValueOut) = 0;
-
+    
         virtual HRESULT ScaleRange(double centerX, double centerY, double scale) = 0;
         virtual HRESULT ChangeRange(ChangeRangeAction action) = 0;
         virtual HRESULT MoveRangeByRatio(double ratioX, double ratioY) = 0;
diff --git a/src/MockGraphingImpl/MockGraphingImpl.vcxproj b/src/MockGraphingImpl/MockGraphingImpl.vcxproj
index f01ea4d..24c70f4 100644
--- a/src/MockGraphingImpl/MockGraphingImpl.vcxproj
+++ b/src/MockGraphingImpl/MockGraphingImpl.vcxproj
@@ -273,6 +273,8 @@
     <ClInclude Include="..\GraphingInterfaces\IGraphingOptions.h" />
     <ClInclude Include="..\GraphingInterfaces\IGraphRenderer.h" />
     <ClInclude Include="..\GraphingInterfaces\IMathSolver.h" />
+    <ClInclude Include="..\GraphingInterfaces\IEquation.h" />
+    <ClInclude Include="..\GraphingInterfaces\IEquationOptions.h" />
     <ClInclude Include="Mocks\MathSolver.h" />
     <ClInclude Include="pch.h" />
     <ClInclude Include="targetver.h" />
@@ -294,4 +296,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>