diff --git a/ngraph/core/include/ngraph/enum_names.hpp b/ngraph/core/include/ngraph/enum_names.hpp
index 213613d8064883..8dbdf6f5cff607 100644
--- a/ngraph/core/include/ngraph/enum_names.hpp
+++ b/ngraph/core/include/ngraph/enum_names.hpp
@@ -28,7 +28,7 @@ namespace ngraph
                 });
                 return rc;
             };
-            for (auto p : get().m_string_enums)
+            for (const auto& p : get().m_string_enums)
             {
                 if (to_lower(p.first) == to_lower(name))
                 {
@@ -41,7 +41,7 @@ namespace ngraph
         /// Converts enum values to strings
         static const std::string& as_string(EnumType e)
         {
-            for (auto& p : get().m_string_enums)
+            for (const auto& p : get().m_string_enums)
             {
                 if (p.second == e)
                 {
diff --git a/ngraph/core/include/ngraph/interval.hpp b/ngraph/core/include/ngraph/interval.hpp
index 08302289f99018..c5cb5453d02a17 100644
--- a/ngraph/core/include/ngraph/interval.hpp
+++ b/ngraph/core/include/ngraph/interval.hpp
@@ -41,9 +41,16 @@ namespace ngraph
         Interval& operator=(const Interval& interval) = default;
 
         /// \brief The number of elements in the interval. Zero if max < min.
-        size_type size() const;
+        size_type size() const
+        {
+            if (m_max_val == s_max)
+            {
+                return m_min_val == s_max ? 0 : s_max;
+            }
+            return m_max_val - m_min_val + 1;
+        }
         /// \brief Returns true if the interval has no elements
-        bool empty() const;
+        bool empty() const { return m_min_val == s_max; }
         /// \brief the inclusive lower bound of the interval
         value_type get_min_val() const { return m_min_val; }
         /// \brief Set the inclusive lower bound of the interval
@@ -84,7 +91,7 @@ namespace ngraph
         Interval& operator&=(const Interval& interval);
 
         /// \brief True if this interval includes value
-        bool contains(value_type value) const;
+        bool contains(value_type value) const { return m_min_val <= value && value <= m_max_val; }
         /// \brief True if this interval includes all the values in interval
         bool contains(const Interval& interval) const;
 
@@ -93,10 +100,6 @@ namespace ngraph
 
     protected:
         void canonicalize();
-        static value_type clip(value_type value);
-        static value_type clip_times(value_type a, value_type b);
-        static value_type clip_add(value_type a, value_type b);
-        static value_type clip_minus(value_type a, value_type b);
 
         value_type m_min_val{0};
         value_type m_max_val{s_max};
diff --git a/ngraph/core/include/ngraph/partial_shape.hpp b/ngraph/core/include/ngraph/partial_shape.hpp
index c100273d765a05..5f4bddf689482d 100644
--- a/ngraph/core/include/ngraph/partial_shape.hpp
+++ b/ngraph/core/include/ngraph/partial_shape.hpp
@@ -54,7 +54,7 @@ namespace ngraph
 
         /// \brief Constructs a PartialShape with static rank from a vector of Dimension.
         /// \param dimensions The Dimension values for the constructed shape.
-        PartialShape(const std::vector<Dimension>& dimensions);
+        PartialShape(std::vector<Dimension> dimensions);
 
         /// \brief Constructs a PartialShape with static rank from a vector of dimensions values.
         /// \param dimensions The Dimension values for the constructed shape.
@@ -269,7 +269,7 @@ namespace ngraph
 
     private:
         // Private constructor for PartialShape::dynamic().
-        PartialShape(bool rank_is_static, const std::vector<Dimension>& dimensions);
+        PartialShape(bool rank_is_static, std::vector<Dimension> dimensions);
 
         // True if the shape's rank is static.
         bool m_rank_is_static;
diff --git a/ngraph/core/src/dimension.cpp b/ngraph/core/src/dimension.cpp
index 2941d1ff083300..6b86316c74080a 100644
--- a/ngraph/core/src/dimension.cpp
+++ b/ngraph/core/src/dimension.cpp
@@ -99,12 +99,12 @@ bool Dimension::merge(Dimension& dst, const Dimension d1, const Dimension d2)
 
 bool Dimension::broadcast_merge(Dimension& dst, const Dimension d1, const Dimension d2)
 {
-    if (d1.m_dimension.size() == 1 && d1.m_dimension.get_min_val() == 1)
+    if (d1.m_dimension.get_min_val() == 1 && d1.m_dimension.size() == 1)
     {
         dst = d2;
         return true;
     }
-    if (d2.m_dimension.size() == 1 && d2.m_dimension.get_min_val() == 1)
+    if (d2.m_dimension.get_min_val() == 1 && d2.m_dimension.size() == 1)
     {
         dst = d1;
         return true;
diff --git a/ngraph/core/src/interval.cpp b/ngraph/core/src/interval.cpp
index f02ad332885e0c..ef8a466fa75502 100644
--- a/ngraph/core/src/interval.cpp
+++ b/ngraph/core/src/interval.cpp
@@ -6,6 +6,46 @@
 
 using namespace ngraph;
 
+namespace
+{
+    Interval::value_type clip(Interval::value_type value)
+    {
+        return std::max(Interval::value_type(0), std::min(Interval::s_max, value));
+    }
+
+    Interval::value_type clip_times(Interval::value_type a, Interval::value_type b)
+    {
+        if (a == 0 || b == 0)
+        {
+            return 0;
+        }
+        else if (a == Interval::s_max || b == Interval::s_max)
+        {
+            return Interval::s_max;
+        }
+        else
+        {
+            return a * b;
+        }
+    }
+    Interval::value_type clip_add(Interval::value_type a, Interval::value_type b)
+    {
+        return (a == Interval::s_max || b == Interval::s_max) ? Interval::s_max : a + b;
+    }
+    Interval::value_type clip_minus(Interval::value_type a, Interval::value_type b)
+    {
+        if (a <= b)
+        {
+            return 0;
+        }
+        if (a == Interval::s_max)
+        {
+            return Interval::s_max;
+        }
+        return a - b;
+    }
+} // namespace
+
 void Interval::canonicalize()
 {
     if (m_max_val < m_min_val)
@@ -28,22 +68,9 @@ Interval::Interval(value_type min_val, value_type max_val)
 }
 
 Interval::Interval(value_type val)
-    : Interval(val, val)
-{
-}
-
-Interval::size_type Interval::size() const
-{
-    if (m_max_val == s_max)
-    {
-        return m_min_val == s_max ? 0 : s_max;
-    }
-    return m_max_val - m_min_val + 1;
-}
-
-bool Interval::empty() const
 {
-    return m_min_val == s_max;
+    m_min_val = clip(val);
+    m_max_val = m_min_val;
 }
 
 bool Interval::operator==(const Interval& interval) const
@@ -116,55 +143,11 @@ Interval& Interval::operator&=(const Interval& interval)
     return *this = *this & interval;
 }
 
-bool Interval::contains(value_type value) const
-{
-    return m_min_val <= value && value <= m_max_val;
-}
-
 bool Interval::contains(const Interval& interval) const
 {
     return contains(interval.m_min_val) && contains(interval.m_max_val);
 }
 
-Interval::value_type Interval::clip(value_type value)
-{
-    return std::max(value_type(0), std::min(s_max, value));
-}
-
-Interval::value_type Interval::clip_add(value_type a, value_type b)
-{
-    return (a == s_max || b == s_max) ? s_max : a + b;
-}
-
-Interval::value_type Interval::clip_minus(value_type a, value_type b)
-{
-    if (a <= b)
-    {
-        return 0;
-    }
-    if (a == s_max)
-    {
-        return s_max;
-    }
-    return a - b;
-}
-
-Interval::value_type Interval::clip_times(value_type a, value_type b)
-{
-    if (a == 0 || b == 0)
-    {
-        return 0;
-    }
-    else if (a == s_max || b == s_max)
-    {
-        return s_max;
-    }
-    else
-    {
-        return a * b;
-    }
-}
-
 constexpr Interval::value_type Interval::s_max;
 
 namespace ngraph
diff --git a/ngraph/core/src/partial_shape.cpp b/ngraph/core/src/partial_shape.cpp
index e02425c4daa7dc..c5222863a1bc1e 100644
--- a/ngraph/core/src/partial_shape.cpp
+++ b/ngraph/core/src/partial_shape.cpp
@@ -34,15 +34,15 @@ PartialShape::PartialShape(const Shape& shape)
 {
 }
 
-PartialShape::PartialShape(bool rank_is_static, const std::vector<Dimension>& dimensions)
+PartialShape::PartialShape(bool rank_is_static, std::vector<Dimension> dimensions)
     : m_rank_is_static(rank_is_static)
-    , m_dimensions(dimensions)
+    , m_dimensions(std::move(dimensions))
 {
 }
 
-PartialShape::PartialShape(const std::vector<Dimension>& dimensions)
+PartialShape::PartialShape(std::vector<Dimension> dimensions)
     : m_rank_is_static(true)
-    , m_dimensions(dimensions)
+    , m_dimensions(std::move(dimensions))
 {
 }
 
@@ -387,7 +387,7 @@ bool PartialShape::broadcast_merge_into(PartialShape& dst,
                     i < (new_rank - src_rank) ? Dimension(1) : src[i - (new_rank - src_rank)];
                 success &= Dimension::broadcast_merge(dims[i], dsti, srci);
             }
-            dst = PartialShape(dims);
+            dst = PartialShape(std::move(dims));
             return success;
         }
     }
diff --git a/ngraph/core/src/type/element_type.cpp b/ngraph/core/src/type/element_type.cpp
index 8d688fbf995104..fd91450cbc722f 100644
--- a/ngraph/core/src/type/element_type.cpp
+++ b/ngraph/core/src/type/element_type.cpp
@@ -12,45 +12,47 @@
 #include "ngraph/type/element_type_traits.hpp"
 
 using namespace ngraph;
-using namespace std;
 
 constexpr DiscreteTypeInfo AttributeAdapter<element::Type>::type_info;
-
-class TypeInfo
+namespace
 {
-public:
-    TypeInfo(size_t bitwidth,
-             bool is_real,
-             bool is_signed,
-             bool is_quantized,
-             const std::string& cname,
-             const std::string& type_name)
-        : m_bitwidth{bitwidth}
-        , m_is_real{is_real}
-        , m_is_signed{is_signed}
-        , m_is_quantized{is_quantized}
-        , m_cname{cname}
-        , m_type_name{type_name}
+    class TypeInfo
     {
-    }
-    size_t m_bitwidth;
-    bool m_is_real;
-    bool m_is_signed;
-    bool m_is_quantized;
-    std::string m_cname;
-    std::string m_type_name;
-};
+    public:
+        TypeInfo(size_t bitwidth,
+                 bool is_real,
+                 bool is_signed,
+                 bool is_quantized,
+                 const std::string& cname,
+                 const std::string& type_name)
+            : m_bitwidth{bitwidth}
+            , m_is_real{is_real}
+            , m_is_signed{is_signed}
+            , m_is_quantized{is_quantized}
+            , m_cname{cname}
+            , m_type_name{type_name}
+        {
+        }
+        size_t m_bitwidth;
+        bool m_is_real;
+        bool m_is_signed;
+        bool m_is_quantized;
+        std::string m_cname;
+        std::string m_type_name;
+    };
 
-struct element_type_hash
-{
-    size_t operator()(element::Type_t t) const { return static_cast<size_t>(t); }
-};
+    struct ElementTypes
+    {
+        struct TypeHash
+        {
+            size_t operator()(element::Type_t t) const { return static_cast<size_t>(t); }
+        };
 
-typedef unordered_map<element::Type_t, const TypeInfo, element_type_hash> element_types_map_t;
+        using ElementsMap = std::unordered_map<element::Type_t, TypeInfo, TypeHash>;
+        static const ElementsMap elements_map;
+    };
 
-static const element_types_map_t& get_type_info_map()
-{
-    static element_types_map_t s_type_info_map{
+    const ElementTypes::ElementsMap ElementTypes::elements_map{
         {element::Type_t::undefined,
          TypeInfo(
              std::numeric_limits<size_t>::max(), false, false, false, "undefined", "undefined")},
@@ -72,8 +74,20 @@ static const element_types_map_t& get_type_info_map()
         {element::Type_t::u32, TypeInfo(32, false, false, false, "uint32_t", "u32")},
         {element::Type_t::u64, TypeInfo(64, false, false, false, "uint64_t", "u64")},
     };
-    return s_type_info_map;
-};
+
+    const ElementTypes::ElementsMap& get_type_info_map() { return ElementTypes::elements_map; };
+
+    const TypeInfo& get_type_info(element::Type_t type)
+    {
+        const auto& tim = get_type_info_map();
+        const auto& found = tim.find(type);
+        if (found == tim.end())
+        {
+            throw std::out_of_range{"element::Type_t not supported"};
+        }
+        return found->second;
+    };
+} // namespace
 
 std::vector<const element::Type*> element::Type::get_known_types()
 {
@@ -103,7 +117,7 @@ element::Type::Type(size_t bitwidth,
                     bool is_quantized,
                     const std::string& /* cname */)
 {
-    for (auto& t : get_type_info_map())
+    for (const auto& t : get_type_info_map())
     {
         const TypeInfo& info = t.second;
         if (bitwidth == info.m_bitwidth && is_real == info.m_is_real &&
@@ -117,7 +131,7 @@ element::Type::Type(size_t bitwidth,
 
 const std::string& element::Type::c_type_string() const
 {
-    return get_type_info_map().at(m_type).m_cname;
+    return get_type_info(m_type).m_cname;
 }
 
 size_t element::Type::size() const
@@ -132,7 +146,7 @@ size_t element::Type::hash() const
 
 const std::string& element::Type::get_type_name() const
 {
-    return get_type_info_map().at(m_type).m_type_name;
+    return get_type_info(m_type).m_type_name;
 }
 
 namespace ngraph
@@ -247,12 +261,12 @@ bool element::Type::merge(element::Type& dst, const element::Type& t1, const ele
 
 bool element::Type::is_static() const
 {
-    return get_type_info_map().at(m_type).m_bitwidth != 0;
+    return get_type_info(m_type).m_bitwidth != 0;
 }
 
 bool element::Type::is_real() const
 {
-    return get_type_info_map().at(m_type).m_is_real;
+    return get_type_info(m_type).m_is_real;
 }
 
 bool element::Type::is_integral_number() const
@@ -262,17 +276,17 @@ bool element::Type::is_integral_number() const
 
 bool element::Type::is_signed() const
 {
-    return get_type_info_map().at(m_type).m_is_signed;
+    return get_type_info(m_type).m_is_signed;
 }
 
 bool element::Type::is_quantized() const
 {
-    return get_type_info_map().at(m_type).m_is_quantized;
+    return get_type_info(m_type).m_is_quantized;
 }
 
 size_t element::Type::bitwidth() const
 {
-    return get_type_info_map().at(m_type).m_bitwidth;
+    return get_type_info(m_type).m_bitwidth;
 }
 
 size_t ngraph::compiler_byte_size(element::Type_t et)