diff --git a/simso/core/Job.py b/simso/core/Job.py
index 92c32d1..4708fd3 100644
--- a/simso/core/Job.py
+++ b/simso/core/Job.py
@@ -169,16 +169,30 @@ class Job(Process):
     @property
     def ret(self):
         """
-        Remaining execution time.
+        Remaining execution time in ms.
         """
         return self.wcet - self.actual_computation_time
 
     @property
+    def laxity(self):
+        """
+        Dynamic laxity of the job in ms.
+        """
+        return (self.absolute_deadline - self.ret
+                ) * self.sim.cycles_per_ms - self.sim.now()
+
+    @property
     def computation_time(self):
+        """
+        Time spent executing the job in ms.
+        """
         return float(self.computation_time_cycles) / self._sim.cycles_per_ms
 
     @property
     def computation_time_cycles(self):
+        """
+        Time spent executing the job.
+        """
         if self._last_exec is None:
             return int(self._computation_time)
         else:
@@ -187,6 +201,10 @@ class Job(Process):
 
     @property
     def actual_computation_time(self):
+        """
+        Computation time in ms as if the processor speed was 1.0 during the
+        whole execution.
+        """
         return float(
             self.actual_computation_time_cycles) / self._sim.cycles_per_ms
 
diff --git a/simso/schedulers/EDCL.py b/simso/schedulers/EDCL.py
index 4c03b69..21a25d2 100644
--- a/simso/schedulers/EDCL.py
+++ b/simso/schedulers/EDCL.py
@@ -21,14 +21,12 @@ class EDCL(Scheduler):
         job.cpu.resched()
 
     def update_laxity(self):
-        for t in self.task_list:
-            if t.is_active():
-                job = t.job
-                laxity = (job.absolute_deadline - job.ret
-                          ) * self.sim.cycles_per_ms - self.sim.now()
+        for task in self.task_list:
+            if task.is_active():
+                job = task.job
                 # if laxity is less than 0, the job will never respect its deadline,
                 # so we do not consider this job as critical
-                if laxity == 0:
+                if job.laxity == 0:
                     job.data['priority'] = 0
                 else:
                     job.data['priority'] = job.absolute_deadline
@@ -54,4 +52,4 @@ class EDCL(Scheduler):
 
             if (cpu_min.running is None or
                     cpu_min.running.absolute_deadline > job.absolute_deadline):
-                return (job, cpu_min)
\ No newline at end of file
+                return (job, cpu_min)
diff --git a/simso/schedulers/EDZL.py b/simso/schedulers/EDZL.py
index 1423125..815187f 100644
--- a/simso/schedulers/EDZL.py
+++ b/simso/schedulers/EDZL.py
@@ -58,8 +58,7 @@ class EDZL(Scheduler):
             # Recherche du prochain event ZeroLaxity pour configurer le timer.
             minimum = None
             for job in self.ready_list:
-                zl_date = int((job.absolute_deadline - job.ret
-                               ) * self.sim.cycles_per_ms - self.sim.now())
+                zl_date = job.laxity
                 if (minimum is None or minimum[0] > zl_date) and zl_date > 0:
                     minimum = (zl_date, job)