diff --git a/doc/uml/activities/scheduler/Scheduling.txt b/doc/uml/activities/scheduler/Scheduling.txt
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+@startuml
+
+'skinparam backgroundColor #AAFFFF
+
+skinparam activity {
+  'StartColor red
+  'BarColor SaddleBrown
+  'EndColor Silver
+  'BackgroundColor Peru
+  BackgroundColor<<MODULE>> Orange
+  'BorderColor Peru
+  'FontName Impact
+}
+
+title **Actual scheduling algorithm (general overview)**
+
+(*) --> "Schedule Creation"
+    --> if "First Schedule ?" then
+        -->[yes] "schedule.plan_night_start = schedule.plan_start"
+        --> "Setting of <b>sequences</b> :  a list of all the observable sequences" as A2
+    else
+        -->[no] "<b>Recovery of previous schedule's data:</b>
+         EXECUTED sequences, plan_night_start, plan_end
+                copy_from_previous_schedule()\l" <<MODULE>>
+    endif
+    --> A2
+    --> "//Add to each sequence its schedule id://
+    sequences = [(sequence, shs) for sequence in sequences]"
+
+    --> "Creation of the interval [plan_start ; plan_end] \land insertion in the intervals list"
+
+    --> "<b>Remove invalid sequences</b>
+    bad parameters : jd1 < 0 for example
+    removeInvalidSequences()"<<MODULE>>
+
+    --> "#TODO <b>Determine priorities according to user and SP</b>"<<MODULE>>
+
+    -->"<b>Remove non eligible sequences</b>
+    //remove UNPLANNABLE sequences : overlap [jd1; jd2], [plan_start; plan_end] < duration for example//
+    removeNonEligibleSequences()" <<MODULE>>
+
+    --> "<b>Sort Sequences</b>
+    //Sort sequences by priority and soonest jd2//
+    sortSequences()"<<MODULE>>
+
+    --> "<b>Check Quota</b>
+    //Check if the user's quota is sufficient//"
+    -->if "Is Quota Sufficient ?" then
+        -->[no] "<b>Reject Sequence</b>"
+
+    else
+        -->[yes]"<b>Get matching intervals</b>
+        //Get the matching intervals for the sequence//"
+    endif
+    -->if "Intervals Found ?" then
+     -->[yes] "<b>Place sequence</b>
+       placeSequence(sequence, shs, matching)" <<MODULE>>
+       --> ==P==
+    else
+     -->[no] "<b>Try Shifting Sequences</b>
+     //Trying to shift the left or/and right sequences//
+     //in order to fit the current sequence//" <<MODULE>>
+
+    endif
+    --> ==P==
+
+    --> if "Sequence PLACED ?" then
+        -->[yes] "Decrease quota()" <<MODULE>>
+        -->"<b>Save Schedule</b>
+         //set the sequence's status at PLANNED//
+          //and save the new schedule//
+          saveSchedule()"<<MODULE>>
+     else
+        -->[no] "<b>Reject Sequence</b>"
+    endif
+
+
+@enduml
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