diff --git a/docs_sphinx/developer.rst b/docs_sphinx/developer.rst
index 65e2dc8..5ea766b 100644
--- a/docs_sphinx/developer.rst
+++ b/docs_sphinx/developer.rst
@@ -16,6 +16,23 @@ BTCS functionalities are externally outsourced and not visible to the user.
 Activity Diagram for run routine in simulation class
 ====================================================
 
+The following activity diagram represents the actions when the run method is called within the simulation class. 
+For better distinction, the activities of the calculation methods FTCS and BTCS are shown in two separate activity diagrams.
+
 .. image:: images/activity_diagram_run.svg
     :width: 2000
-    :alt: Activity diagram for the run method in the simulation class
\ No newline at end of file
+    :alt: Activity diagram for the run method in the simulation class
+
+
+**Activity Diagram for FTCS method**
+
+.. image:: images/activity_diagram_FTCS.svg
+    :width: 400
+    :alt: Activity diagram for the FTCS method
+
+
+**Activity Diagram for BTCS method**
+
+.. image:: images/activity_diagram_BTCS.svg
+    :width: 400
+    :alt: Activity diagram for the BTCS method
diff --git a/docs_sphinx/images/activity_diagram_BTCS.svg b/docs_sphinx/images/activity_diagram_BTCS.svg
new file mode 100644
index 0000000..a0ebabc
--- /dev/null
+++ b/docs_sphinx/images/activity_diagram_BTCS.svg
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
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diff --git a/docs_sphinx/images/activity_diagram_FTCS.svg b/docs_sphinx/images/activity_diagram_FTCS.svg
new file mode 100644
index 0000000..3f4a9d2
--- /dev/null
+++ b/docs_sphinx/images/activity_diagram_FTCS.svg
@@ -0,0 +1,4 @@
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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 345px; margin-left: 106px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: nowrap;">...</div></div></div></foreignObject><text x="106" y="349" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">...</text></switch></g><rect x="140.3" y="330" width="30" height="30" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 345px; margin-left: 155px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: nowrap;">...</div></div></div></foreignObject><text x="155" y="349" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">...</text></switch></g><rect x="94" y="270" width="70" height="30" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; 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