diff --git a/main_package/classes/structure_estimator.py b/main_package/classes/structure_estimator.py
new file mode 100644
index 0000000..59555b1
--- /dev/null
+++ b/main_package/classes/structure_estimator.py
@@ -0,0 +1,170 @@
+import pandas as pd
+import numpy as np
+import math
+import itertools
+import networkx as nx
+from scipy.stats import f as f_dist
+from scipy.stats import chi2 as chi2_dist
+
+
+import sample_path as sp
+import structure as st
+import network_graph as ng
+import parameters_estimator as pe
+
+
+class StructureEstimator:
+
+    def __init__(self, sample_path, exp_test_alfa, chi_test_alfa):
+        self.sample_path = sample_path
+        self.complete_graph_frame = self.build_complete_graph_frame(self.sample_path.structure.list_of_nodes_labels())
+        self.complete_graph = self.build_complete_graph(self.sample_path.structure.list_of_nodes_labels())
+        self.exp_test_sign = exp_test_alfa
+        self.chi_test_alfa = chi_test_alfa
+
+    def build_complete_graph_frame(self, node_ids):
+        complete_frame = pd.DataFrame(itertools.permutations(node_ids, 2))
+        complete_frame.columns = ['From', 'To']
+        return complete_frame
+
+    def build_complete_graph(self, node_ids):
+        complete_graph = nx.DiGraph()
+        complete_graph.add_nodes_from(node_ids)
+        complete_graph.add_edges_from(itertools.permutations(node_ids, 2))
+        return complete_graph
+
+    def complete_test(self, test_parent, test_child, parent_set):
+        tmp_df = self.complete_graph_frame.loc[self.complete_graph_frame['To'].isin([test_child])]
+        #print(tmp_df)
+        d1 = tmp_df.loc[tmp_df['From'].isin(parent_set)]
+        parent_set.append(test_child)
+        #print(parent_set)
+        v1 = self.sample_path.structure.variables_frame.loc[self.sample_path.structure.variables_frame['Name'].isin(parent_set)]
+        s1 = st.Structure(d1, v1, self.sample_path.total_variables_count)
+        g1 = ng.NetworkGraph(s1)
+        g1.init_graph()
+
+        parent_set.append(test_parent)
+        d2 = tmp_df.loc[tmp_df['From'].isin(parent_set)]
+        v2 = self.sample_path.structure.variables_frame.loc[self.sample_path.structure.variables_frame['Name'].isin(parent_set)]
+        #print(d2)
+        #print(v2)
+        s2 = st.Structure(d2, v2, self.sample_path.total_variables_count)
+        g2 = ng.NetworkGraph(s2)
+        g2.init_graph()
+
+        p1 = pe.ParametersEstimator(self.sample_path, g1)
+        p1.init_sets_cims_container()
+        p1.compute_parameters()
+
+        p2 = pe.ParametersEstimator(self.sample_path, g2)
+        p2.init_sets_cims_container()
+        p2.compute_parameters()
+
+        #for cim in p1.sets_of_cims_struct.sets_of_cims[s1.get_positional_node_indx(test_child)].actual_cims:
+            #print(cim)
+            #print(cim.state_transition_matrix)
+        #print("C_1", p1.sets_of_cims_struct.sets_of_cims[s1.get_positional_node_indx(test_child)].transition_matrices)
+        indx = 0
+        for i, cim1 in enumerate(
+                p1.sets_of_cims_struct.sets_of_cims[s1.get_positional_node_indx(test_child)].actual_cims):
+
+            #for j, cim2 in enumerate(
+                    #p2.sets_of_cims_struct.sets_of_cims[s2.get_positional_node_indx(test_child)].actual_cims):
+            for j in range(indx, self.sample_path.structure.get_states_number(test_parent) + indx):
+                print("J", j)
+                cim2 = p2.sets_of_cims_struct.sets_of_cims[s2.get_positional_node_indx(test_child)].actual_cims[j]
+                indx += 1
+                print(indx)
+
+
+                print("Run Test", i, j)
+                if not self.independence_test(test_child, cim1, cim2):
+                    return False
+        return True
+
+    def independence_test(self, tested_child, cim1, cim2):
+        # Fake exp test
+        for val in range(0, self.sample_path.structure.get_states_number(tested_child)):  # i possibili valori di tested child TODO QUESTO CONTO DEVE ESSERE VETTORIZZATO
+            r1 = cim1.state_transition_matrix[val][val]
+            r2 = cim2.state_transition_matrix[val][val]
+            print("No Test Parent:",cim1.cim[val][val],"With Test Parent", cim2.cim[val][val])
+            F = cim2.cim[val][val] / cim1.cim[val][val]
+
+            print("Exponential test", F, r1, r2)
+            #print(f_dist.ppf(1 - self.exp_test_sign / 2, r1, r2))
+            #print(f_dist.ppf(self.exp_test_sign / 2, r1, r2))
+            if F < f_dist.ppf(self.exp_test_sign / 2, r1, r2) or \
+                    F > f_dist.ppf(1 - self.exp_test_sign / 2, r1, r2):
+                print("CONDITIONALLY DEPENDENT EXP")
+                return False
+        # fake chi test
+        M1_no_diag = self.remove_diagonal_elements(cim1.state_transition_matrix)
+        M2_no_diag = self.remove_diagonal_elements(cim2.state_transition_matrix)
+        print("M1 no diag", M1_no_diag)
+        print("M2 no diag", M2_no_diag)
+        chi_2_quantile = chi2_dist.ppf(1 - self.chi_test_alfa, self.sample_path.structure.get_states_number(tested_child) - 1)
+        for val in range(0, self.sample_path.structure.get_states_number(tested_child)):
+            K = math.sqrt(cim1.state_transition_matrix[val][val] / cim2.state_transition_matrix[val][val])
+            L = 1 / K
+            Chi = np.sum(np.power(K * M2_no_diag[val] - L *M1_no_diag[val], 2) /
+                         (M1_no_diag[val] + M2_no_diag[val]))
+            print("Chi Stats", Chi)
+            print("Chi Quantile", chi_2_quantile)
+            if Chi > chi_2_quantile:
+                print("CONDITIONALLY DEPENDENT CHI")
+                return False
+            #print("Chi test", Chi)
+        return True
+
+    def one_iteration_of_CTPC_algorithm(self, var_id):
+        u = list(self.complete_graph.predecessors(var_id))
+        tests_parents_numb = len(u)
+        #print(u)
+        b = 0
+        parent_indx = 0
+        while b < len(u):
+            #for parent_id in u:
+            parent_indx = 0
+            while u and parent_indx < tests_parents_numb and b < len(u):
+                # list_without_test_parent = u.remove(parent_id)
+                removed = False
+                print("b", b)
+                print("Parent Indx", parent_indx)
+                #if not list(self.generate_possible_sub_sets_of_size(u, b, u[parent_indx])):
+                    #break
+                S = self.generate_possible_sub_sets_of_size(u, b, u[parent_indx])
+                print("U Set", u)
+                print("S", S)
+                for parents_set in S:
+                    print("Parent Set", parents_set)
+                    print("Test Parent", u[parent_indx])
+                    if self.complete_test(u[parent_indx], var_id, parents_set):
+                        print("Removing EDGE:", u[parent_indx], var_id)
+                        self.complete_graph.remove_edge(u[parent_indx], var_id)
+                        #self.complete_graph_frame = \
+                            #self.complete_graph_frame[(self.complete_graph_frame.From !=
+                                                     # u[parent_indx]) & (self.complete_graph_frame.To != var_id)]
+                        u.remove(u[parent_indx])
+                        removed = True
+                    #else:
+                        #parent_indx += 1
+                if not removed:
+                    parent_indx += 1
+            b += 1
+
+    def generate_possible_sub_sets_of_size(self, u, size, parent_id):
+        print("Inside Generate subsets", u)
+        print("InsideGenerate Subsets", parent_id)
+        list_without_test_parent = u[:]
+        list_without_test_parent.remove(parent_id)
+        # u.remove(parent_id)
+        #print(list(map(list, itertools.combinations(list_without_test_parent, size))))
+        return map(list, itertools.combinations(list_without_test_parent, size))
+
+    def remove_diagonal_elements(self, matrix):
+        m = matrix.shape[0]
+        strided = np.lib.stride_tricks.as_strided
+        s0, s1 = matrix.strides
+        return strided(matrix.ravel()[1:], shape=(m - 1, m), strides=(s0 + s1, s1)).reshape(m, -1)
+
diff --git a/main_package/tests/test_parameters_estimator.py b/main_package/tests/test_parameters_estimator.py
index 10a7256..5170295 100644
--- a/main_package/tests/test_parameters_estimator.py
+++ b/main_package/tests/test_parameters_estimator.py
@@ -7,7 +7,7 @@ import sets_of_cims_container as scc
 import parameters_estimator as pe
 import json_importer as ji
 
-
+#TODO bisogna trovare un modo per testare i metodi che stimano i tempi e le transizioni per i singoli nodi
 class TestParametersEstimatior(unittest.TestCase):
 
     @classmethod
diff --git a/main_package/tests/test_structure_estimator.py b/main_package/tests/test_structure_estimator.py
new file mode 100644
index 0000000..571d5a5
--- /dev/null
+++ b/main_package/tests/test_structure_estimator.py
@@ -0,0 +1,31 @@
+import unittest
+
+import sample_path as sp
+import structure_estimator as se
+
+class TestStructureEstimator(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls) -> None:
+        cls.s1 = sp.SamplePath('../data', 'samples', 'dyn.str', 'variables', 'Time', 'Name')
+        cls.s1.build_trajectories()
+        cls.s1.build_structure()
+
+    def test_init(self):
+        se1 = se.StructureEstimator(self.s1)
+        self.assertEqual(self.s1, se1.sample_path)
+        self.assertEqual(se1.complete_graph_frame.shape[0],
+                         self.s1.total_variables_count *(self.s1.total_variables_count - 1))
+
+    def test_one_iteration(self):
+        se1 = se.StructureEstimator(self.s1, 0.1, 0.1)
+        se1.one_iteration_of_CTPC_algorithm('X')
+        #self.aux_test_complete_test(se1, 'X', 'Y', ['Z'])
+        print(se1.complete_graph.edges)
+
+    def aux_test_complete_test(self, estimator, test_par, test_child, p_set):
+        estimator.complete_test(test_par, test_child, p_set)
+
+
+if __name__ == '__main__':
+    unittest.main()