diff --git a/bin/tests/scheduler b/bin/tests/scheduler
deleted file mode 100755
index b4fb232..0000000
Binary files a/bin/tests/scheduler and /dev/null differ
diff --git a/include/base.h b/include/base.h
index 9fa9168..5f7b0ea 100644
--- a/include/base.h
+++ b/include/base.h
@@ -29,10 +29,16 @@
 
 #define BASE_H
 
+struct {
+    int x;
+    int y;
+    int z;
+} typedef Arrow_t;
+
 struct {
     size_t size;
-    bool *space;
-} typedef BoolArray_t;
+    Arrow_t *space;
+} typedef ArrowArray_t; //XXX
 
 struct {
     size_t size;
@@ -42,24 +48,24 @@ struct {
 #define LOGMSG "[%s]"
 #define printLog(FORMAT, ...) printf(LOGMSG " " FORMAT, __func__, ##__VA_ARGS__)
 
+/* -------------------------------------------------------------------------- */
+
 //
 // Scheduler
 //
 
 struct {
-    BoolArray_t *globalPreemptionSpace;
     IntArray_t *globalDrawingSpace;
     IntArray_t *transitionsTree;
-    IntArray_t *arrowList;
+    ArrowArray_t *arrowList;
     int nmaxThread;
     int nmaxCycles;
+    int ruleRadius;
     pthread_t *id;
     bool stopped;
 } typedef Scheduler_t;
 
-struct {
-    pthread_t *id;
-} typedef Worker_t;
+/* -------------------------------------------------------------------------- */
 
 //
 // Local threads
@@ -76,4 +82,4 @@ struct Center_t {
 struct {
     pthread_t *id;
     Center_t *localWorkAreaCenter;
-} typedef Thread_t;
+} typedef Worker_t;
diff --git a/include/localworker.h b/include/localworker.h
index 5b6aaea..99cbcd2 100644
--- a/include/localworker.h
+++ b/include/localworker.h
@@ -26,21 +26,20 @@
 // -------------------------------------------------------------------------- //
 // Worker init function                                                       //
 // -------------------------------------------------------------------------- //
-pthread_t *WorkerInit(Worker_t *parameters);
+pthread_t *WorkerInit(Worker_t *worker);
 
 // -------------------------------------------------------------------------- //
 // Worker destructor function                                                 //
 // -------------------------------------------------------------------------- //
-static inline int WorkerDestroy(pthread_t *schedThread)
+static inline void WorkerDestroy(Worker_t *worker)
 {
-    free(schedThread);
-    return 0;
+    free(worker->id);
 }
 
 // -------------------------------------------------------------------------- //
 // Worker wait function                                                       //
 // -------------------------------------------------------------------------- //
-static inline void WorkerWait(pthread_t *schedThread)
+static inline void WorkerWait(Worker_t *worker)
 {
-    pthread_join(*schedThread, NULL);
+    pthread_join(*worker->id, NULL);
 }
diff --git a/include/scheduler.h b/include/scheduler.h
index 990d9b1..4dc6493 100644
--- a/include/scheduler.h
+++ b/include/scheduler.h
@@ -26,21 +26,20 @@
 // -------------------------------------------------------------------------- //
 // Scheduler init function                                                    //
 // -------------------------------------------------------------------------- //
-pthread_t *SchedInit(Scheduler_t *parameters);
+pthread_t *SchedInit(Scheduler_t *scheduler);
 
 // -------------------------------------------------------------------------- //
 // Scheduler destructor function                                              //
 // -------------------------------------------------------------------------- //
-static inline int SchedDestroy(pthread_t *schedThread)
+static inline void SchedDestroy(Scheduler_t *scheduler)
 {
-    free(schedThread);
-    return 0;
+    free(scheduler->id);
 }
 
 // -------------------------------------------------------------------------- //
 // Scheduler wait function                                                    //
 // -------------------------------------------------------------------------- //
-static inline void SchedWait(pthread_t *schedThread)
+static inline void SchedWait(Scheduler_t *scheduler)
 {
-    pthread_join(*schedThread, NULL);
+    pthread_join(*scheduler->id, NULL);
 }
diff --git a/src/localworker.c b/src/localworker.c
index 528194c..610c7c5 100644
--- a/src/localworker.c
+++ b/src/localworker.c
@@ -21,31 +21,31 @@
 
 #include "../include/base.h"
 
-static void *LittleWorker(void *parameters);
+static void *LittleWorker(void *worker);
 
 /* -------------------------------------------------------------------------- */
 
 // -------------------------------------------------------------------------- //
 // Scheduler init function                                                    //
 // -------------------------------------------------------------------------- //
-pthread_t *WorkerInit(Scheduler_t *parameters)
+pthread_t *WorkerInit(Worker_t *worker)
 {
-    parameters->id = (pthread_t*) malloc(sizeof(pthread_t));
-    pthread_create(parameters->id, NULL, LittleWorker, parameters);
-    return parameters->id;
+    worker->id = (pthread_t*) malloc(sizeof(pthread_t));
+    pthread_create(worker->id, NULL, LittleWorker, worker);
+    return worker->id;
 }
 
 // -------------------------------------------------------------------------- //
 // Scheduler thread main function                                             //
 // -------------------------------------------------------------------------- //
-static void *LittleWorker(void *params)
+static void *LittleWorker(void *worker)
 {
-    Worker_t *parameters = (Worker_t*) params;
+    Worker_t *args = (Worker_t*) worker;
     int a = 4;
 
     for (int i = 0; i < 45000; i++) {
         for (int j = i; j < 45000; j++) {
-            a = (a + (long)parameters->id) * i * j;
+            a = (a + (long)args->id) * i * j;
         }
     }
 
diff --git a/src/main.c b/src/main.c
index 4717805..5b0edb4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -29,28 +29,6 @@
 #define SPACE_SIZE 10000
 #define MAX_THREAD 0
 
-void SchedulerCrashTest(void)
-{
-    const int maxthread = 16;
-
-    Scheduler_t *scheduler0 =
-        (Scheduler_t*) calloc(1, sizeof(Scheduler_t));
-
-    pthread_t **schedThread =
-        (pthread_t**) malloc(sizeof(pthread_t*) * maxthread);
-
-    for (int i=0; i < maxthread; i++) {
-        schedThread[i] = SchedInit(scheduler0);
-    }
-
-    for (int i=0; i < maxthread; i++) {
-        SchedWait(schedThread[i]);
-        SchedDestroy(schedThread[i]);
-    }
-
-    free(scheduler0);
-}
-
 int main(int argc, char **argv)
 {
     time_t t;
@@ -70,19 +48,13 @@ int main(int argc, char **argv)
     //
     scheduler0 = (Scheduler_t*) malloc(sizeof(Scheduler_t));
 
-    scheduler0->globalPreemptionSpace =
-        (BoolArray_t*) malloc(sizeof(BoolArray_t));
-    scheduler0->globalPreemptionSpace->space =
-        (bool*) malloc(sizeof(bool)*SPACE_SIZE);
-    scheduler0->globalPreemptionSpace->size = SPACE_SIZE;
-
     scheduler0->globalDrawingSpace = (IntArray_t*) malloc(sizeof(IntArray_t));
     scheduler0->globalDrawingSpace->space =
         (int*) malloc(sizeof(int)*SPACE_SIZE);
     scheduler0->globalDrawingSpace->size = SPACE_SIZE;
 
-    scheduler0->arrowList = (IntArray_t*) malloc(sizeof(IntArray_t));
-    scheduler0->arrowList->space = (int*) malloc(sizeof(int)*ARROW_NUMBER);
+    scheduler0->arrowList = (ArrowArray_t*) malloc(sizeof(ArrowArray_t));
+    scheduler0->arrowList->space = (Arrow_t*) malloc(sizeof(Arrow_t)*ARROW_NUMBER);
     scheduler0->arrowList->size = ARROW_NUMBER;
     
     scheduler0->nmaxThread = MAX_THREAD;
@@ -93,16 +65,13 @@ int main(int argc, char **argv)
     //
     SchedInit(scheduler0);
 
-    SchedWait(scheduler0->id);
+    SchedWait(scheduler0);
 
-    SchedDestroy(scheduler0->id);
+    SchedDestroy(scheduler0);
 
     free(scheduler0->globalDrawingSpace->space);
     free(scheduler0->globalDrawingSpace);
 
-    free(scheduler0->globalPreemptionSpace->space);
-    free(scheduler0->globalPreemptionSpace);
-
     free(scheduler0->arrowList->space);
     free(scheduler0->arrowList);
 
diff --git a/src/scheduler.c b/src/scheduler.c
index c38ae1c..341d075 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -31,11 +31,11 @@ static void *GreatScheduler(void *parameters);
 // -------------------------------------------------------------------------- //
 // Scheduler init function                                                    //
 // -------------------------------------------------------------------------- //
-pthread_t *SchedInit(Scheduler_t *parameters)
+pthread_t *SchedInit(Scheduler_t *scheduler)
 {
-    parameters->id = (pthread_t*) malloc(sizeof(pthread_t));
-    pthread_create(parameters->id, NULL, GreatScheduler, parameters);
-    return parameters->id;
+    scheduler->id = (pthread_t*) malloc(sizeof(pthread_t));
+    pthread_create(scheduler->id, NULL, GreatScheduler, scheduler);
+    return scheduler->id;
 }
 
 // -------------------------------------------------------------------------- //
@@ -68,56 +68,110 @@ static inline void centerRemove(Center_t *oldCenter)
     if (oldCenter->next) oldCenter->next->prev = oldCenter->prev;
 }
 
+/* -------------------------------------------------------------------------- */
+
 // -------------------------------------------------------------------------- //
 // Scheduler area finder function                                             //
 // -------------------------------------------------------------------------- //
-static Center_t *findWorkArea(Center_t *centerList, int ruleRadius, size_t spaceSize)
+static Center_t *findWorkArea(Center_t *centersList, Arrow_t *electedArrow,
+                              int ruleRadius, size_t spaceSize)
 {
-    Center_t *myCenter = (Center_t*) malloc(sizeof(Center_t));
-    centerAssign(myCenter, rand() % spaceSize, 0, 0); /* Je suis né quelque part.(ou pas !).*/
+    register Center_t *currentCenter = centersList;
 
-    while (centerList != NULL){
-        //printLog("Center : %d\n", centerList->x);
-        if (abs(myCenter->x - centerList->x) < ruleRadius){
-            printLog("FAIL: no work area available at %d\n", myCenter->x);
-            free(myCenter);
-            return NULL;
+    while (currentCenter){
+        //printLog("Center : %d\n", currentCenter->x);
+        if (    abs(electedArrow->x - currentCenter->x) >= ruleRadius
+            &&  abs(electedArrow->y - currentCenter->y) >= ruleRadius
+            &&  abs(electedArrow->z - currentCenter->z) >= ruleRadius
+            ){
+            return currentCenter;
         }
-        centerList = centerList->next;
-    }
-
-    printLog("SUCCESS ! at %d: < I've found a center.\n", myCenter->x);
-
-    return myCenter;
-}
-
-// -------------------------------------------------------------------------- //
-// Scheduler thread main function                                             //
-// -------------------------------------------------------------------------- //
-static void *GreatScheduler(void *params)
-{
-    // récupération des paramètres et annonce
-    Scheduler_t *args = (Scheduler_t*) params;
-    printLog("Scheduler id %lu: Bonjour I'm the boss !\n", *(args->id));
-
-    int ncpu = get_nprocs();
-    printLog("%d CPUs available.\n", ncpu);
-
-    Thread_t *workerArray = (Thread_t*) malloc(sizeof(Thread_t) * 3 * ncpu);
-    Center_t *centersList = (Center_t*) malloc(sizeof(Center_t));
-
-    centerAssign(centersList, -1, -1, -1);
-
-    Center_t *workArea;
-    int i = 0;
-
-    while (!args->stopped) {
-        while ((workArea = findWorkArea(centersList, 4, 30))) {
-            i++;
-            centerAdd(centersList, workArea);
-        }
-        printLog("New centers : %d\n", i);
+        currentCenter = currentCenter->next;
     }
 
     return NULL;
 }
+
+/* -------------------------------------------------------------------------- */
+
+// -------------------------------------------------------------------------- //
+// Scheduler thread main function                                             //
+// -------------------------------------------------------------------------- //
+static void *GreatScheduler(void *scheduler)
+{
+    Scheduler_t *args;
+    Worker_t *workerArray;
+    Center_t *centersList, *workArea;
+    Arrow_t *electedArrow;
+    long ncycles;
+    int ncpu, nworker;
+
+
+    // Getting scheduler argument structure
+    args = (Scheduler_t*) scheduler;
+    printLog("Scheduler #%lu online\n", *(args->id));
+
+    ncpu = get_nprocs();
+    printLog("%d CPUs available.\n", ncpu);
+
+    // Data structures
+    workerArray = (Worker_t*) calloc(ncpu, sizeof(Worker_t));
+    nworker = 0;
+    centersList = (Center_t*) calloc(1, sizeof(Center_t));
+    ncycles = 0;
+
+    //
+    // MAIN LOOP
+    //
+    while (!args->stopped && ncycles <= args->nmaxCycles) {
+        // Increment cycles
+        ncycles++;
+
+        // TODO statistics here
+
+        // Create a new thread
+        if (nworker < ncpu) {
+            // Random choice of an arrow
+            electedArrow =
+                &args->arrowList->space[rand() % args->arrowList->size];
+
+            // Find a local area
+            workArea = findWorkArea(centersList, electedArrow, args->ruleRadius,
+                                    args->globalDrawingSpace->size);
+
+            // If a free area exists,
+            if (workArea) {
+                // preempt it,
+                centerAdd(centersList, workArea);
+                // find a worker socket,
+                for (int i = 0; i < ncpu; i++) {
+                    if (!workerArray[i].id) {
+                        // prepare the worker for the area,
+                        workerArray[i].localWorkAreaCenter = workArea;
+                        // create the worker,
+                        WorkerInit(&workerArray[i]);
+                        // and increment worker count.
+                        nworker++;
+                        break;
+                    }
+                }
+            }
+        }
+
+        // TODO Delete finished workers
+        for (int i = 0; i < ncpu; i++) {
+            // XXX
+        }
+    }
+
+    // TODO Exiting scheduler properly
+
+    // Waiting for remaining workers
+    for (int i = 0; i < ncpu; i++) {
+        // XXX
+    }
+
+    printLog("Scheduler #%lu offline\n", *(args->id));
+
+    return NULL;
+}