diff --git a/study.py b/study.py
index 2532d13..3b956e8 100644
--- a/study.py
+++ b/study.py
@@ -12,7 +12,20 @@ from DAS import *
 # https://stackoverflow.com/questions/58026381/logging-nested-functions-using-joblib-parallel-and-delayed-calls
 # and https://github.com/joblib/joblib/issues/1017
 
-def runOnce(sim, config, shape):
+def initLogger(config):
+    """It initializes the logger."""
+    logger = logging.getLogger("Study")
+    logger.setLevel(config.logLevel)
+    ch = logging.StreamHandler()
+    ch.setLevel(config.logLevel)
+    ch.setFormatter(CustomFormatter())
+    logger.addHandler(ch)
+    return logger
+
+def runOnce(config, shape):
+
+    sim = Simulator(shape, config)
+
     if config.deterministic:
         shape.setSeed(config.randomSeed+"-"+str(shape))
         random.seed(shape.randomSeed)
@@ -40,24 +53,24 @@ def study():
             print("You need to pass a configuration file in parameter")
             exit(1)
 
-    shape = Shape(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
-    sim = Simulator(shape, config)
-    sim.initLogger()
+    logger = initLogger(config)
+    format = {"entity": "Study"}
+
     results = []
 
     now = datetime.now()
     execID = now.strftime("%Y-%m-%d_%H-%M-%S_")+str(random.randint(100,999))
 
-    sim.logger.info("Starting simulations:", extra=sim.format)
+    logger.info("Starting simulations:", extra=format)
     start = time.time()
-    results = Parallel(config.numJobs)(delayed(runOnce)(sim, config, shape) for shape in config.nextShape())
+    results = Parallel(config.numJobs)(delayed(runOnce)(config, shape) for shape in config.nextShape())
     end = time.time()
-    sim.logger.info("A total of %d simulations ran in %d seconds" % (len(results), end-start), extra=sim.format)
+    logger.info("A total of %d simulations ran in %d seconds" % (len(results), end-start), extra=format)
 
     if config.dumpXML:
         for res in results:
             res.dump(execID)
-        sim.logger.info("Results dumped into results/%s/" % (execID), extra=sim.format)
+        logger.info("Results dumped into results/%s/" % (execID), extra=format)
 
     if config.visualization:
         vis = Visualizer(execID)