diff --git a/libopenfpga/libarchopenfpga/src/technology_library.cpp b/libopenfpga/libarchopenfpga/src/technology_library.cpp
index e1f289c75..519fa0897 100644
--- a/libopenfpga/libarchopenfpga/src/technology_library.cpp
+++ b/libopenfpga/libarchopenfpga/src/technology_library.cpp
@@ -48,8 +48,16 @@ std::string TechnologyLibrary::device_name(const TechnologyDeviceId& device_id)
   return device_names_[device_id]; 
 }
 
-/* Access the id of a technology device by name */
+/* Access the id of a technology device by name,
+ * If the name is valid, we return a valid id
+ * Otherwise, return an invalid id
+ */
 TechnologyDeviceId TechnologyLibrary::device(const std::string& name) const {
+  std::map<std::string, TechnologyDeviceId>::const_iterator it = device_name2ids_.find(name);
+  if (it != device_name2ids_.end()) {
+    return TechnologyDeviceId::INVALID();
+  }
+
   return device_name2ids_.at(name); 
 }
 
@@ -207,8 +215,16 @@ std::string TechnologyLibrary::variation_name(const TechnologyVariationId& varia
   return variation_names_[variation_id]; 
 }
 
-/* Access the id of a technology variation by name */
+/* Access the id of a technology variation by name
+ * If the name is valid, we return a valid id
+ * Otherwise, return an invalid id
+ */
 TechnologyVariationId TechnologyLibrary::variation(const std::string& name) const {
+  std::map<std::string, TechnologyVariationId>::const_iterator it = variation_name2ids_.find(name);
+  if (it != variation_name2ids_.end()) {
+    return TechnologyVariationId::INVALID();
+  }
+
   return variation_name2ids_.at(name); 
 }
 
@@ -471,6 +487,38 @@ void TechnologyLibrary::set_variation_num_sigma(const TechnologyVariationId& var
   return;
 }
 
+/************************************************************************
+ * Public mutators: linkers
+ ***********************************************************************/
+/* This function builds the links between devices and variations,
+ * which have been defined in the technology library
+ */
+void TechnologyLibrary::link_devices_to_variations() {
+  for (const TechnologyDeviceId& device : devices()) {
+    /* For transistors, find the variation name for each model and build a link */
+    if (TECH_LIB_DEVICE_TRANSISTOR == device_type(device)) {
+      /* PMOS transistor, if a variation name is specified, we try to build a link
+       * Otherwise, we assign any invalid id */
+      const std::string& pmos_var_name = transistor_model_variation_names_[device][TECH_LIB_TRANSISTOR_PMOS];
+      transistor_model_variation_ids_[device][TECH_LIB_TRANSISTOR_PMOS] = variation(pmos_var_name);
+
+      /* NMOS transistor, if a variation name is specified, we try to build a link
+       * Otherwise, we assign any invalid id 
+       */
+      const std::string& nmos_var_name = transistor_model_variation_names_[device][TECH_LIB_TRANSISTOR_NMOS];
+      transistor_model_variation_ids_[device][TECH_LIB_TRANSISTOR_NMOS] = variation(nmos_var_name);
+      /* Finish for transistors, go to the next */
+      continue;
+    } 
+
+    /* Reach here it means an RRAM device, we find the variation name and try to build a link */ 
+    VTR_ASSERT(TECH_LIB_DEVICE_RRAM == device_type(device));
+    const std::string& rram_var_name = rram_variation_names_[device];
+    rram_variation_ids_[device] = variation(rram_var_name);
+    /* Finish for RRAMs, go to the next */
+  }
+}
+
 /************************************************************************
  * Internal invalidators/validators 
  ***********************************************************************/
diff --git a/libopenfpga/libarchopenfpga/src/technology_library.h b/libopenfpga/libarchopenfpga/src/technology_library.h
index ae78da00b..bd0b40607 100644
--- a/libopenfpga/libarchopenfpga/src/technology_library.h
+++ b/libopenfpga/libarchopenfpga/src/technology_library.h
@@ -52,12 +52,12 @@ constexpr std::array<const char*, NUM_TECH_LIB_DEVICE_TYPES> TECH_LIB_DEVICE_TYP
  * 2. PMOS transistor 
  *******************************************************************/
 enum e_tech_lib_trans_type {
-  TECH_LIB_TRANS_PMOS, 
-  TECH_LIB_TRANS_NMOS, 
-  NUM_TECH_LIB_TRANS_TYPES
+  TECH_LIB_TRANSISTOR_PMOS, 
+  TECH_LIB_TRANSISTOR_NMOS, 
+  NUM_TECH_LIB_TRANSISTOR_TYPES
 };
 /* Strings correspond to transistor type */
-constexpr std::array<const char*, NUM_TECH_LIB_TRANS_TYPES> TECH_LIB_TRANS_TYPE_STRING = {{"pmos", "nmos"}};
+constexpr std::array<const char*, NUM_TECH_LIB_TRANSISTOR_TYPES> TECH_LIB_TRANSISTOR_TYPE_STRING = {{"pmos", "nmos"}};
 
 /********************************************************************
  * Process corners supported 
@@ -155,6 +155,8 @@ class TechnologyLibrary {
     TechnologyVariationId add_variation(const std::string& name);
     void set_variation_abs_value(const TechnologyVariationId& variation_id, const float& abs_value);
     void set_variation_num_sigma(const TechnologyVariationId& variation_id, const size_t& num_sigma);
+  public: /* Public Mutators: linkers */
+    void link_devices_to_variations();
   public: /* Public invalidators/validators */
     bool valid_device_id(const TechnologyDeviceId& device_id) const;
     bool valid_variation_id(const TechnologyVariationId& variation_id) const;