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diff --git a/doc/uml/use_case_diagram.dot b/doc/uml/use_case_diagram.dot
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+++ b/doc/uml/use_case_diagram.dot
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+// This is a graphviz file. To generate a diagram from this source,
+// you must first install graphviz (available from homebrew). Then run
+// the following command:
+//
+// dot -Tpng -o use_case_diagram.png use_case_diagram.dot
+
+digraph G {
+    fontname = "Bitstream Vera Sans";
+    fontsize = 12;
+
+    node [
+        fontname = "Bitstream Vera Sans";
+        fontsize = 12;
+        shape = "ellipse";
+    ]
+
+    edge [
+        fontname = "Bitstream Vera Sans";
+        fontsize = 12;
+    ]
+
+    edge [
+        arrowhead = "empty";
+    ]
+
+    subgraph cluster_actors {
+        color = white;
+        node [
+            shape = custom;
+            shapefile = "actor.png";
+	    width = 0.352;
+            height = 0.77;
+            fixedsize = true;
+	    color = "#ffffff";
+        ]
+	ciq [label = "CIQ"];
+        cron [label = "cron"]
+	technician [label = "Technician"];
+    }
+
+    subgraph cluster_processes { 
+        style = filled;
+        color = azure2;
+        populate_database [label = "Populate database"];
+        monitor_hardware [label = "Monitor hardware"];
+        install_caas [label = "Install CaaS"];
+    }
+
+    {
+        edge [color = red;]
+        ciq -> populate_database [label = "Populates"];
+    }
+    
+    {
+        edge [color = chocolate4;]
+        cron -> install_caas [label = "Starts"];
+    }
+    
+    {
+        edge [color = blue;]
+        technician -> monitor_hardware [label = "Waits for"];
+    }
+    
+    {
+        edge [
+            label = "Uses";
+            color = green4;
+        ]
+        install_caas -> monitor_hardware;
+        monitor_hardware -> populate_database;
+    }
+}