diff --git a/ReversalModel/reversal.pml b/ReversalModel/reversal.pml
index c75a667..a45a107 100644
--- a/ReversalModel/reversal.pml
+++ b/ReversalModel/reversal.pml
@@ -5,15 +5,26 @@
 int to_reverse[LENGTH]; // array to reverse
 int reversed[LENGTH]; // array where the reverse is stored
 
+mtype = { END };
+
 // ThreadedReverser implementation
-proctype ThreadedReverser(int from; int to) {
+proctype ThreadedReverser(int from; int to; chan out) {
+    printf("proc[%d]: started\n", _pid);
+    
     int k;
     for (k: from .. to) {
         reversed[LENGTH - k - 1] = to_reverse[k];
-    } 
+    }
+
+    printf("proc[%d]: ended\n", _pid);
+    
+end:
+    out!_pid;
 }
 
 init {
+    chan in = [N] of { mtype };
+
     // array initialization
     {
         int i;
@@ -27,6 +38,10 @@ init {
     // ParallelReverser implementation
     int n;
     int s = LENGTH / N;
+
+    pid pids[N];
+    
+    // fork section
     for (n: 0 .. N) {
         int from = n * s;
         int to;
@@ -34,7 +49,14 @@ init {
         :: (n == N - 1) -> to = LENGTH;
         :: else -> to = n * s + s; 
         fi
-        run ThreadedReverser(from, to);
+        pids[n] = run ThreadedReverser(from, to, in);
+    }
+
+    // join section
+    for (n: 0 .. N) {
+        in??eval(pids[n]);
+
+        printf("init: joined process %d\n", pids[n]);
     }    
 }