diff --git a/what-changed/model/server_variable.go b/what-changed/model/server_variable.go
index e6c99af..01bbd98 100644
--- a/what-changed/model/server_variable.go
+++ b/what-changed/model/server_variable.go
@@ -2,3 +2,73 @@
 // SPDX-License-Identifier: MIT
 
 package model
+
+import (
+	"github.com/pb33f/libopenapi/datamodel/low"
+	"github.com/pb33f/libopenapi/datamodel/low/v3"
+)
+
+type ServerVariableChanges struct {
+	PropertyChanges
+}
+
+func CompareServerVariables(l, r *v3.ServerVariable) *ServerVariableChanges {
+	if low.AreEqual(l, r) {
+		return nil
+	}
+
+	var props []*PropertyCheck
+	var changes []*Change
+
+	lValues := make(map[string]low.NodeReference[string])
+	rValues := make(map[string]low.NodeReference[string])
+	for i := range l.Enum {
+		lValues[l.Enum[i].Value] = l.Enum[i]
+	}
+	for i := range r.Enum {
+		rValues[r.Enum[i].Value] = r.Enum[i]
+	}
+	for k := range lValues {
+		if _, ok := rValues[k]; !ok {
+			CreateChange(&changes, ObjectRemoved, v3.EnumLabel,
+				lValues[k].ValueNode, nil, true,
+				lValues[k].Value, nil)
+			continue
+		}
+	}
+	for k := range rValues {
+		if _, ok := lValues[k]; !ok {
+			CreateChange(&changes, ObjectAdded, v3.EnumLabel,
+				lValues[k].ValueNode, rValues[k].ValueNode, false,
+				lValues[k].Value, rValues[k].Value)
+		}
+	}
+
+	// default
+	props = append(props, &PropertyCheck{
+		LeftNode:  l.Default.ValueNode,
+		RightNode: r.Default.ValueNode,
+		Label:     v3.DefaultLabel,
+		Changes:   &changes,
+		Breaking:  true,
+		Original:  l,
+		New:       r,
+	})
+
+	// description
+	props = append(props, &PropertyCheck{
+		LeftNode:  l.Description.ValueNode,
+		RightNode: r.Description.ValueNode,
+		Label:     v3.DescriptionLabel,
+		Changes:   &changes,
+		Breaking:  false,
+		Original:  l,
+		New:       r,
+	})
+
+	// check everything.
+	CheckProperties(props)
+	sc := new(ServerVariableChanges)
+	sc.Changes = changes
+	return sc
+}
diff --git a/what-changed/model/server_variable_test.go b/what-changed/model/server_variable_test.go
new file mode 100644
index 0000000..da55fc4
--- /dev/null
+++ b/what-changed/model/server_variable_test.go
@@ -0,0 +1,164 @@
+// Copyright 2022 Princess B33f Heavy Industries / Dave Shanley
+// SPDX-License-Identifier: MIT
+
+package model
+
+import (
+	"github.com/pb33f/libopenapi/datamodel/low"
+	v3 "github.com/pb33f/libopenapi/datamodel/low/v3"
+	"github.com/stretchr/testify/assert"
+	"gopkg.in/yaml.v3"
+	"testing"
+)
+
+func TestCompareServerVariables(t *testing.T) {
+
+	left := `description: hi
+default: hello
+enum:
+  - one
+  - two`
+
+	right := `description: hi
+default: hello
+enum:
+  - one
+  - two`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc v3.ServerVariable
+	var rDoc v3.ServerVariable
+	_ = low.BuildModel(&lNode, &lDoc)
+	_ = low.BuildModel(&rNode, &rDoc)
+
+	// compare.
+	extChanges := CompareServerVariables(&lDoc, &rDoc)
+	assert.Nil(t, extChanges)
+
+}
+
+func TestCompareServerVariables_EnumRemoved(t *testing.T) {
+
+	left := `description: hi
+default: hello
+enum:
+  - one
+  - two`
+
+	right := `description: hi
+default: hello
+enum:
+  - one`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc v3.ServerVariable
+	var rDoc v3.ServerVariable
+	_ = low.BuildModel(&lNode, &lDoc)
+	_ = low.BuildModel(&rNode, &rDoc)
+
+	// compare.
+	extChanges := CompareServerVariables(&lDoc, &rDoc)
+	assert.Equal(t, 1, extChanges.TotalChanges())
+	assert.Equal(t, 1, extChanges.TotalBreakingChanges())
+	assert.Equal(t, ObjectRemoved, extChanges.Changes[0].ChangeType)
+
+}
+
+func TestCompareServerVariables_Modified(t *testing.T) {
+
+	left := `description: hi
+default: hello
+enum:
+  - one
+  - two`
+
+	right := `description: hi
+default: hello
+enum:
+  - one
+  - two
+  - three`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc v3.ServerVariable
+	var rDoc v3.ServerVariable
+	_ = low.BuildModel(&lNode, &lDoc)
+	_ = low.BuildModel(&rNode, &rDoc)
+
+	// compare.
+	extChanges := CompareServerVariables(&lDoc, &rDoc)
+	assert.Equal(t, 1, extChanges.TotalChanges())
+	assert.Equal(t, 0, extChanges.TotalBreakingChanges())
+}
+
+func TestCompareServerVariables_Added(t *testing.T) {
+
+	left := `description: hi
+default: hello
+enum:
+  - one
+  - two`
+
+	right := `description: hi
+enum:
+  - one
+  - two`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc v3.ServerVariable
+	var rDoc v3.ServerVariable
+	_ = low.BuildModel(&lNode, &lDoc)
+	_ = low.BuildModel(&rNode, &rDoc)
+
+	// compare.
+	extChanges := CompareServerVariables(&lDoc, &rDoc)
+	assert.Equal(t, 1, extChanges.TotalChanges())
+	assert.Equal(t, 1, extChanges.TotalBreakingChanges())
+	assert.Equal(t, PropertyAdded, extChanges.Changes[0].ChangeType)
+}
+
+func TestCompareServerVariables_Removed(t *testing.T) {
+
+	left := `description: hi
+default: hello
+enum:
+  - one
+  - two`
+
+	right := `description: hi
+enum:
+  - one
+  - two`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc v3.ServerVariable
+	var rDoc v3.ServerVariable
+	_ = low.BuildModel(&lNode, &lDoc)
+	_ = low.BuildModel(&rNode, &rDoc)
+
+	// compare.
+	extChanges := CompareServerVariables(&rDoc, &lDoc)
+	assert.Equal(t, 1, extChanges.TotalChanges())
+	assert.Equal(t, 1, extChanges.TotalBreakingChanges())
+	assert.Equal(t, PropertyAdded, extChanges.Changes[0].ChangeType)
+}