diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4555e27..67fcdc5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,8 @@
 cmake_minimum_required(VERSION 3.12)
 
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
 project(essim
   LANGUAGES CXX
   VERSION 0.1
diff --git a/src/imports/import_base.hpp b/src/imports/import_base.hpp
index 4954b5c..3656e09 100644
--- a/src/imports/import_base.hpp
+++ b/src/imports/import_base.hpp
@@ -4,27 +4,31 @@
 #include <string>
 #include <fstream>
 
-#include "system/connect.hpp"
 #include "system/parts.hpp"
+#include "system/signals.hpp"
 
 class ImportBase
 {
 protected:
     Parts *prts;
-    virtual void parse(std::fstream lines) = 0;
+    Signals *sigs;
+    std::fstream file_lines;
 public:
-    ImportBase()
+    ImportBase(std::string file_name) : file_lines(std::fstream(file_name))
     {
         prts = new Parts();
-    }
-    void load(std::string file_name) {
-        std::ifstream file(file_name);
-
+        sigs = new Signals();
     };
-    Parts *parts()
+    virtual void parse() = 0;
+    Parts * parts()
     {
         return prts;
     }
+    Signals * signals()
+    {
+        return sigs;
+    }
+    virtual ~ImportBase() = default;
 };
 
 #endif // _IMPORT_BASE_HPP_
\ No newline at end of file
diff --git a/src/imports/import_mentor.cpp b/src/imports/import_mentor.cpp
index 92120d4..416e827 100644
--- a/src/imports/import_mentor.cpp
+++ b/src/imports/import_mentor.cpp
@@ -1,67 +1,93 @@
 
 #include "import_mentor.hpp"
-#include "system/parts.hpp"
 #include "system/pins.hpp"
+#include "system/parts.hpp"
 
+#include <vector>
 #include <string>
 #include <regex>
 
-enum class State {
+using namespace std;
+
+enum class State
+{
     NO_PART,
     IS_PART,
 };
 
-ImportMentor::ImportMentor(): ImportBase() {
+ImportMentor::ImportMentor(string filename) : ImportBase(filename) {}
 
-}
-
-ImportMentor::~ImportMentor() {
+ImportMentor::~ImportMentor()
+{
     ImportBase::~ImportBase();
 }
 
-void ImportMentor::parse(std::fstream lines) {
-    std::string line;
+void ImportMentor::parse()
+{
+    string line;
     auto state = State::NO_PART;
-    const std::regex name_regex("\\'([^\\']*)\\'");
-    const std::regex part_regex("^COMP:");
-    const std::regex pin_regex("^Explicit Pin:");
+    const regex name_regex("'([^'\\s][^']*)'");
+    const regex part_regex("^COMP:");
+    const regex pin_regex("^\\s*Explicit Pin:");
 
-    while (std::getline(lines, line))
+    bool is_name_match = false;
+    bool is_part_match = false;
+    bool is_pin_match = false;
+    Part *prt = nullptr;
+    while (getline(file_lines, line))
     {
-        Part *prt = nullptr;
-        std::smatch name_match;
-        bool is_name_match = std::regex_match(line, name_match, part_regex);
-        bool is_part_match = std::regex_match(line, part_regex);
-        bool is_pin_match = std::regex_match(line, pin_regex);
+        vector<string> names;
+        for (sregex_iterator it(line.begin(), line.end(), name_regex), end; it != end; ++it)
+        {
+            names.push_back((*it)[1]);
+        }
+        is_name_match = (names.size() > 0);
+        is_part_match = regex_search(line, part_regex);
+        is_pin_match = regex_search(line, pin_regex);
         switch (state)
         {
         case State::NO_PART:
-            if (is_part_match) {
-                if (is_name_match) {
-                    prt = new Part(name_match[0]);
+            if (is_part_match)
+            {
+                if (is_name_match)
+                {
+                    prt = new Part(names[1]);
                     state = State::IS_PART;
                 }
             }
             break;
 
         default:
-            if (is_part_match) {
-                if (is_name_match) {
-                    prts->add(*prt);
-                    prt = new Part(name_match[0]);
+            if (is_part_match)
+            {
+                if (is_name_match)
+                {
+                    prts->add(prt);
+                    prt = new Part(names[1]);
                 }
             }
             else if (is_pin_match)
             {
-                if (is_name_match) {
-                    auto pin = new Pin(name_match[0]);
-                    prt->add(*pin);
+                if (is_name_match)
+                {
+                    auto pin = new Pin(names[0]);
+                    Signal *s = nullptr;
+                    prt->add(pin);
+                    if (!sigs->exists(names[2]))
+                    {
+                        s = new Signal(names[2]);
+                        sigs->add(s);
+                    } else {
+                        s = sigs->get(names[2]);
+                    };
+                    pin->connect(s);
                 }
             }
             break;
         }
-        if (state == State::IS_PART) {
-            prts->add(*prt);
-        }
+    }
+    if (state == State::IS_PART)
+    {
+        prts->add(prt);
     }
 }
\ No newline at end of file
diff --git a/src/imports/import_mentor.hpp b/src/imports/import_mentor.hpp
index 30547d4..f3d6886 100644
--- a/src/imports/import_mentor.hpp
+++ b/src/imports/import_mentor.hpp
@@ -7,9 +7,9 @@
 
 class ImportMentor : public ImportBase
 {
-    void parse(std::fstream lines);
 public:
-    ImportMentor();
+    ImportMentor(std::string filename);
+    void parse() override;
     ~ImportMentor();
 };
 
diff --git a/src/main.cpp b/src/main.cpp
index 4d81784..a8fad52 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,18 +1,10 @@
-#include "system/signals.hpp"
+#include "system/system.hpp"
 
 using namespace std;
 
 int main() {
-    auto sigs = Signals();
-    Signal *sig = nullptr;
-    int i=0;
-    string sname = "";
-
-    while (i < 10) {
-        sname = "signal" + to_string(i);
-        sig = new Signal(sname);
-        sigs.add(*sig);
-        i++;
-    }
+    System sys = System();
+    string ment_filename = "/home/francois/Projets/twinsys/test/BPB-2177_Netlist_2_3.qcv";
 
+    sys.Load("bpb", ment_filename, ImportType::IMPORT_MENTOR);
 };
diff --git a/src/system/connect.cpp b/src/system/connect.cpp
index 784aeb2..d089558 100644
--- a/src/system/connect.cpp
+++ b/src/system/connect.cpp
@@ -4,4 +4,4 @@ Connection::Connection(std::string name) : SystemElement(name) {};
 
 Connections::Connections(void): SystemElementContainer<Connection>("connections") {}
 
-Connections::Connections(std::vector<Connection> conns): SystemElementContainer<Connection>("connections", conns) {}
\ No newline at end of file
+Connections::Connections(std::vector<Connection *> conns): SystemElementContainer<Connection>("connections", conns) {}
\ No newline at end of file
diff --git a/src/system/connect.hpp b/src/system/connect.hpp
index aa00bcc..5b36e46 100644
--- a/src/system/connect.hpp
+++ b/src/system/connect.hpp
@@ -13,7 +13,7 @@ class Connections : public SystemElementContainer<Connection>
 {
 public:
     Connections(void);
-    Connections(std::vector<Connection> connections);
+    Connections(std::vector<Connection *> connections);
 };
 
 #endif // _CONNECT_HPP_
\ No newline at end of file
diff --git a/src/system/modules.cpp b/src/system/modules.cpp
index 5b1d6c0..343f64c 100644
--- a/src/system/modules.cpp
+++ b/src/system/modules.cpp
@@ -1,7 +1,7 @@
 #include "modules.hpp"
 
-Module::Module(std::string name) : SystemElementContainer<Part>(name) {};
+Module::Module(std::string name) : SystemElementContainer<Part>(name) {}
 
 Modules::Modules(void): SystemElementContainer<Module>("modules") {}
 
-Modules::Modules(std::vector<Module> modules): SystemElementContainer<Module>("modules", modules) {}
\ No newline at end of file
+Modules::Modules(std::vector<Module *> modules): SystemElementContainer<Module>("modules", modules) {}
\ No newline at end of file
diff --git a/src/system/modules.hpp b/src/system/modules.hpp
index 4a11a75..935133a 100644
--- a/src/system/modules.hpp
+++ b/src/system/modules.hpp
@@ -3,10 +3,12 @@
 
 #include "syselmts.hpp"
 #include "parts.hpp"
+#include "signals.hpp"
 
 class Module : public SystemElementContainer<Part>
 {
 public:
+    Signals sigs;
     Module(std::string name);
 };
 
@@ -14,7 +16,7 @@ class Modules : public SystemElementContainer<Module>
 {
 public:
     Modules(void);
-    Modules(std::vector<Module> pins);
+    Modules(std::vector<Module *> pins);
 };
 
 #endif // _MODULES_HPP_
\ No newline at end of file
diff --git a/src/system/parts.cpp b/src/system/parts.cpp
index 9e2ecc9..8542c20 100644
--- a/src/system/parts.cpp
+++ b/src/system/parts.cpp
@@ -4,4 +4,4 @@ Part::Part(std::string name) : SystemElementContainer<Pin>(name) {};
 
 Parts::Parts(void): SystemElementContainer<Part>("parts") {}
 
-Parts::Parts(std::vector<Part> parts): SystemElementContainer<Part>("parts", parts) {}
\ No newline at end of file
+Parts::Parts(std::vector<Part *> parts): SystemElementContainer<Part>("parts", parts) {}
\ No newline at end of file
diff --git a/src/system/parts.hpp b/src/system/parts.hpp
index 6f4205c..d3485d1 100644
--- a/src/system/parts.hpp
+++ b/src/system/parts.hpp
@@ -14,7 +14,7 @@ class Parts : public SystemElementContainer<Part>
 {
 public:
     Parts(void);
-    Parts(std::vector<Part> parts);
+    Parts(std::vector<Part *> parts);
 };
 
 #endif // _PARTS_HPP_
\ No newline at end of file
diff --git a/src/system/pins.cpp b/src/system/pins.cpp
index 2a50a73..fa4fb6a 100644
--- a/src/system/pins.cpp
+++ b/src/system/pins.cpp
@@ -1,7 +1,16 @@
 #include "pins.hpp"
 
-Pin::Pin(std::string name) : SystemElement(name) {};
+Pin::Pin(std::string name) : SystemElement(name), sig(nullptr) {};
+
+bool Pin::connected() {
+    return sig != nullptr;
+}
+
+void Pin::connect(Signal *signal)
+{
+    sig = signal;
+}
 
 Pins::Pins(void): SystemElementContainer<Pin>("pins") {}
 
-Pins::Pins(std::vector<Pin> pins): SystemElementContainer<Pin>("pins", pins) {}
\ No newline at end of file
+Pins::Pins(std::vector<Pin *> pins): SystemElementContainer<Pin>("pins", pins) {}
\ No newline at end of file
diff --git a/src/system/pins.hpp b/src/system/pins.hpp
index ea2fb68..dfa3169 100644
--- a/src/system/pins.hpp
+++ b/src/system/pins.hpp
@@ -2,18 +2,22 @@
 #define _PINS_HPP_
 
 #include "syselmts.hpp"
+#include "signals.hpp"
 
 class Pin : public SystemElement
 {
+    Signal *sig;
 public:
     Pin(std::string name);
+    bool connected();
+    void connect(Signal *signal);
 };
 
 class Pins : public SystemElementContainer<Pin>
 {
 public:
     Pins(void);
-    Pins(std::vector<Pin> pins);
+    Pins(std::vector<Pin *> pins);
 };
 
 #endif // _PINS_HPP_
\ No newline at end of file
diff --git a/src/system/signals.cpp b/src/system/signals.cpp
index 3d2f05d..5b15cd5 100644
--- a/src/system/signals.cpp
+++ b/src/system/signals.cpp
@@ -5,5 +5,5 @@ Signal::Signal(std::string name) : SystemElementContainer<Pin>(name) {};
 
 Signals::Signals(void): SystemElementContainer<Signal>("signals") {}
 
-Signals::Signals(std::vector<Signal> signals): SystemElementContainer<Signal>("signals", signals) {}
+Signals::Signals(std::vector<Signal *> signals): SystemElementContainer<Signal>("signals", signals) {}
 
diff --git a/src/system/signals.hpp b/src/system/signals.hpp
index d1649d6..c9493c6 100644
--- a/src/system/signals.hpp
+++ b/src/system/signals.hpp
@@ -2,7 +2,9 @@
 #define _SIGNALS_HPP_
 
 #include "syselmts.hpp"
-#include "pins.hpp"
+
+#pragma once
+class Pin;
 
 class Signal : public SystemElementContainer<Pin>
 {
@@ -14,7 +16,7 @@ class Signals : public SystemElementContainer<Signal>
 {
 public:
     Signals(void);
-    Signals(std::vector<Signal> signals);
+    Signals(std::vector<Signal *> signals);
 };
 
 #endif // _SIGNALS_HPP_
\ No newline at end of file
diff --git a/src/system/syselmts.hpp b/src/system/syselmts.hpp
index e8807a6..ea259fe 100644
--- a/src/system/syselmts.hpp
+++ b/src/system/syselmts.hpp
@@ -6,65 +6,82 @@
 #include <unordered_map>
 #include <stdexcept>
 
+using namespace std;
+
 class SystemElement
 {
 public:
-    std::string name;
-    SystemElement(std::string name) : name(name) {};
+    string name;
+    SystemElement(string name) : name(name) {};
 };
 
 template <typename T>
 class SystemElementContainer : public SystemElement
 {
 private:
-    static_assert(std::is_base_of<SystemElement, T>::value, "T shall be a system element descendant !");
+    //static_assert(is_base_of<SystemElement, T>::value, "T shall be a system element descendant !");
     unsigned int iter_count;
-    std::unordered_map<std::string, T> content;
+    unordered_map<string, T*> content;
 
-    bool name_exists(std::string name)
+    void add(unordered_map<string, T*> el_content)
     {
-        return get(name) != nullptr;
+        for (const auto &[key, value] : el_content)
+        {
+            add(value);
+        }
     }
 
 public:
-    SystemElementContainer(std::string name) : SystemElement(name) {};
-    SystemElementContainer(std::string name, std::vector<T> elements) : SystemElement(name)
+    SystemElementContainer(string name) : SystemElement(name) {};
+    SystemElementContainer(string name, vector<T *> elements) : SystemElement(name)
     {
         add(elements);
     }
-    void add(T element)
+    bool exists(string name)
     {
-        if ("" == element.name)
+        try
         {
-            throw std::runtime_error("System elements with empty names are forbidden");
+            get(name);
+            return true;
         }
-        if (name_exists(element.name))
+        catch (const exception &e)
         {
-            throw std::runtime_error("System elements of same names are forbidden");
+            return false;
         }
-        content.insert({element.name, element});
     }
-    void add(SystemElementContainer<T> elements)
+    void add(T* element)
     {
-        add(elements.content);
+        if ("" == element->name)
+        {
+            throw runtime_error("System elements with empty names are forbidden");
+        }
+        if (exists(element->name))
+        {
+            throw runtime_error("System elements of same names are forbidden");
+        }
+        content.insert({element->name, element});
     }
-    void add(std::vector<T> elements)
+    void add(SystemElementContainer<T> *elements)
+    {
+        add(elements->content);
+    }
+    void add(vector<T*> elements)
     {
         for (auto &element : elements)
         {
             add(element);
         }
     }
-    T *get(std::string name)
+    T *get(string name)
     {
         auto it = content.find(name);
         if (it != content.end())
         {
-            return &it->second;
+            return it->second;
         }
         else
         {
-            return nullptr;
+            throw runtime_error("System elements not found");
         }
     }
 };