diff --git a/benchmarks.py b/benchmarks.py
index 1ca0f34..5a3df46 100644
--- a/benchmarks.py
+++ b/benchmarks.py
@@ -1,10 +1,15 @@
 import numpy as np
 import pandas as pd
-#import matplotlib as plt
+import matplotlib as plt
 import matplotlib.pyplot as plt
 from mpl_toolkits.mplot3d import Axes3D
 
-from pyFTS import *
+from pyFTS import common
+
+def Teste(par):
+	x = np.arange(1,par)
+	y = [ yy**yy for yyy in x]
+	plt.plot(x,y)
 
 # Erro quadrático médio
 def rmse(predictions,targets):
@@ -119,7 +124,7 @@ def SelecaoKFold_MenorRMSE(original,parameters,modelo):
 	min_rmse_fold = 100000.0
 	bestd = None
 	fc = 0
-	diff = diferencas(original)       
+	diff = common.differential(original)       
 	kf = KFold(len(original), n_folds=nfolds)
 	for train_ix, test_ix in kf:
 		train = diff[train_ix]
@@ -180,7 +185,7 @@ def SelecaoSimples_MenorRMSE(original,parameters,modelo):
 	min_rmse = 100000.0
 	best = None
 	for p in parameters:
-		sets = GridPartitionerTrimf(original,p)
+		sets = common.GridPartitionerTrimf(original,p)
 		fts = modelo(str(p)+ " particoes")
 		fts.learn(original,sets)
 		predicted = [fts.predict(xx) for xx in original]
@@ -216,9 +221,9 @@ def SelecaoSimples_MenorRMSE(original,parameters,modelo):
 	min_rmse = 100000.0
 	bestd = None
 	for p in parameters:
-		sets = GridPartitionerTrimf(diferencas(original),p)
+		sets = common.GridPartitionerTrimf(common.differential(original),p)
 		fts = modelo(str(p)+ " particoes")
-		fts.learn(diferencas(original),sets)
+		fts.learn(common.differential(original),sets)
 		predicted = [fts.predictDiff(original, xx) for xx in range(1,len(original))]
 		predicted.insert(0,original[0])
 		ax2.plot(predicted,label=fts.name)
@@ -367,7 +372,7 @@ def HOSelecaoSimples_MenorRMSE(original,parameters,orders):
 	for p in parameters:
 		oc = 0
 		for o in orders:
-			sets = GridPartitionerTrimf(diferencas(original),p)
+			sets = common.GridPartitionerTrimf(common.differential(original),p)
 			fts = HighOrderFTS(o,"k = " + str(p)+ " w = " + str(o))
 			fts.learn(original,sets)
 			predicted = [fts.predictDiff(original, xx) for xx in range(o,len(original))]
diff --git a/common.py b/common.py
index 1e68b41..b99703b 100644
--- a/common.py
+++ b/common.py
@@ -1,3 +1,12 @@
+import numpy as np
+from pyFTS import *
+
+def differential(original):
+    n = len(original)
+    diff = [ original[t-1]-original[t] for t in np.arange(1,n) ]
+    diff.insert(0,0)
+    return np.array(diff)
+
 def trimf(x,parameters):
 	if(x < parameters[0]):
 		return 0
diff --git a/fts.py b/fts.py
index 91cb50e..c4cd802 100644
--- a/fts.py
+++ b/fts.py
@@ -1,3 +1,5 @@
+from pyFTS import *
+
 class FTS:
 	def __init__(self,order,name):
 		self.sets = {}
diff --git a/hwang.py b/hwang.py
index 8ba552a..7d5e7e5 100644
--- a/hwang.py
+++ b/hwang.py
@@ -1,4 +1,6 @@
-class HighOrderFTS(FTS):
+from pyFTS import *
+
+class HighOrderFTS(fts.FTS):
 	def __init__(self,order,name):
 		super(HighOrderFTS, self).__init__(order,name)
         
diff --git a/ismailefendi.py b/ismailefendi.py
index e425725..1c88a85 100644
--- a/ismailefendi.py
+++ b/ismailefendi.py
@@ -1,3 +1,5 @@
+from pyFTS import *
+
 class ImprovedWeightedFLRG:
 	def __init__(self,premiss):
 		self.premiss = premiss
@@ -24,7 +26,7 @@ class ImprovedWeightedFLRG:
 		return tmp + tmp2
 		
 
-class ImprovedWeightedFTS(FTS):
+class ImprovedWeightedFTS(fts.FTS):
 	def __init__(self,name):
 		super(ImprovedWeightedFTS, self).__init__(1,name)
         
diff --git a/sadaei.py b/sadaei.py
index a7f0223..664964e 100644
--- a/sadaei.py
+++ b/sadaei.py
@@ -1,3 +1,5 @@
+from pyFTS import *
+
 class ExponentialyWeightedFLRG:
 	def __init__(self,premiss,c):
 		self.premiss = premiss
@@ -27,7 +29,7 @@ class ExponentialyWeightedFLRG:
 			cc = cc + 1
 		return tmp + tmp2
 		
-class ExponentialyWeightedFTS(FTS):
+class ExponentialyWeightedFTS(fts.FTS):
 	def __init__(self,name):
 		super(ExponentialyWeightedFTS, self).__init__(1,name)
         
diff --git a/yu.py b/yu.py
index 8cbee58..845b117 100644
--- a/yu.py
+++ b/yu.py
@@ -1,4 +1,6 @@
-class WeightedFLRG(FTS):
+from pyFTS import *
+
+class WeightedFLRG(fts.FTS):
 	def __init__(self,premiss):
 		self.premiss = premiss
 		self.consequent = []
@@ -25,7 +27,7 @@ class WeightedFLRG(FTS):
 		return tmp + tmp2
 		
 
-class WeightedFTS(FTS):
+class WeightedFTS(fts.FTS):
 	def __init__(self,name):
 		super(WeightedFTS, self).__init__(1,name)