diff --git a/libopenfpga/libarchopenfpga/arch/sample_arch.xml b/libopenfpga/libarchopenfpga/arch/sample_arch.xml
index a5f5c9adf..09dff4a9b 100644
--- a/libopenfpga/libarchopenfpga/arch/sample_arch.xml
+++ b/libopenfpga/libarchopenfpga/arch/sample_arch.xml
@@ -32,10 +32,10 @@
       </device_model>
     </device_library>
     <variation_library>
-      <variation name="logic_transistor_var" abs_variation="0.1" num_sigma="3"/>
-      <variation name="io_transistor_var" abs_variation="0.1" num_sigma="3"/>
-      <variation name="mem_rram_var" abs_variation="0.1" num_sigma="3"/>
-      <variation name="logic_rram_var" abs_variation="0.1" num_sigma="3"/>
+      <variation name="logic_transistor_var" abs_deviation="0.1" num_sigma="3"/>
+      <variation name="io_transistor_var" abs_deviation="0.1" num_sigma="3"/>
+      <variation name="mem_rram_var" abs_deviation="0.1" num_sigma="3"/>
+      <variation name="logic_rram_var" abs_deviation="0.1" num_sigma="3"/>
     </variation_library>
   </technology_library>
   <circuit_library>
diff --git a/libopenfpga/libarchopenfpga/src/read_xml_openfpga_arch.cpp b/libopenfpga/libarchopenfpga/src/read_xml_openfpga_arch.cpp
index af66f78ad..8b7506f36 100644
--- a/libopenfpga/libarchopenfpga/src/read_xml_openfpga_arch.cpp
+++ b/libopenfpga/libarchopenfpga/src/read_xml_openfpga_arch.cpp
@@ -51,6 +51,8 @@ openfpga::Arch read_xml_openfpga_arch(const char* arch_file_name) {
     /* Parse technology library */
     auto xml_tech_lib = get_single_child(xml_openfpga_arch, "technology_library", loc_data); 
     openfpga_arch.tech_lib = read_xml_technology_library(xml_tech_lib, loc_data);
+    /* Build the internal link for technology library */
+    openfpga_arch.tech_lib.link_models_to_variations();
 
     /* Second node should be <openfpga_simulation_setting> */
     auto xml_simulation_settings = get_single_child(doc, "openfpga_simulation_setting", loc_data); 
diff --git a/libopenfpga/libarchopenfpga/src/read_xml_technology_library.cpp b/libopenfpga/libarchopenfpga/src/read_xml_technology_library.cpp
index 6db188744..f7e40a969 100644
--- a/libopenfpga/libarchopenfpga/src/read_xml_technology_library.cpp
+++ b/libopenfpga/libarchopenfpga/src/read_xml_technology_library.cpp
@@ -193,6 +193,20 @@ void read_xml_device_model(pugi::xml_node& xml_device_model,
   }
 }
 
+/********************************************************************
+ * Parse XML codes of a <variation> to an object of technology library
+ *******************************************************************/
+static 
+void read_xml_device_variation(pugi::xml_node& xml_device_variation,
+                               const pugiutil::loc_data& loc_data,
+                               TechnologyLibrary& tech_lib) {
+  /* Get the name of this variation and add it to the technology library */
+  TechnologyVariationId variation = tech_lib.add_variation(get_attribute(xml_device_variation, "name", loc_data).as_string());
+
+  tech_lib.set_variation_abs_value(variation, get_attribute(xml_device_variation, "abs_deviation", loc_data).as_float(0.));
+  tech_lib.set_variation_num_sigma(variation, get_attribute(xml_device_variation, "num_sigma", loc_data).as_int(0.));
+}
+
 /********************************************************************
  * Parse XML codes of a <device_library> to an object of technology library
  *******************************************************************/
@@ -212,6 +226,25 @@ void read_xml_device_lib(pugi::xml_node& xml_device_lib,
   } 
 }
 
+/********************************************************************
+ * Parse XML codes of a <variation_library> to an object of technology library
+ *******************************************************************/
+static 
+void read_xml_variation_lib(pugi::xml_node& xml_variation_lib,
+                            const pugiutil::loc_data& loc_data,
+                            TechnologyLibrary& tech_lib) {
+  /* Iterate over the children under this node,
+   * each child should be named after <variation>
+   */
+  for (pugi::xml_node xml_device_variation : xml_variation_lib.children()) {
+    /* Error out if the XML child has an invalid name! */
+    if (xml_device_variation.name() != std::string("variation")) {
+      bad_tag(xml_device_variation, loc_data, xml_variation_lib, {"variation"});
+    }
+    read_xml_device_variation(xml_device_variation, loc_data, tech_lib);
+  } 
+}
+
 /********************************************************************
  * Parse XML codes about <technology_library> to an object of technology library
  *******************************************************************/
@@ -240,6 +273,7 @@ TechnologyLibrary read_xml_technology_library(pugi::xml_node& Node,
   }
 
   pugi::xml_node xml_variation_lib = get_first_child(Node, "variation_library", loc_data);
+  read_xml_variation_lib(xml_variation_lib, loc_data, tech_lib);
 
   return tech_lib;
 }
diff --git a/libopenfpga/libarchopenfpga/src/technology_library.cpp b/libopenfpga/libarchopenfpga/src/technology_library.cpp
index e3680465d..1638d13e1 100644
--- a/libopenfpga/libarchopenfpga/src/technology_library.cpp
+++ b/libopenfpga/libarchopenfpga/src/technology_library.cpp
@@ -461,6 +461,7 @@ TechnologyVariationId TechnologyLibrary::add_variation(const std::string& name)
 
   /* This is a legal name. we can create a new id */
   TechnologyVariationId variation = TechnologyVariationId(variation_ids_.size());
+  variation_ids_.push_back(variation);
   variation_names_.push_back(name);
   variation_abs_values_.push_back(0.);
   variation_num_sigmas_.push_back(size_t(-1));