diff --git a/src/metaschema/oscal_component_metaschema.xml b/src/metaschema/oscal_component_metaschema.xml
index c757be4c80..d2a89f148c 100644
--- a/src/metaschema/oscal_component_metaschema.xml
+++ b/src/metaschema/oscal_component_metaschema.xml
@@ -26,6 +26,7 @@
   </remarks>
 
   <import href="oscal_implementation-common_metaschema.xml"/>
+  <import href="oscal_rules-common_metaschema.xml"/>
 
   <define-assembly name="component-definition">
     <formal-name>Component Definition</formal-name>
@@ -41,6 +42,17 @@
       <assembly ref="import-component-definition" max-occurs="unbounded">
         <group-as name="import-component-definitions" in-json="ARRAY"/>
       </assembly>
+      <assembly ref="rule-definition" max-occurs="unbounded">
+        <use-name>rule</use-name>
+        <group-as name="rules" in-json="ARRAY"/>
+      </assembly>
+      <assembly ref="test-definition" max-occurs="unbounded">
+        <use-name>test</use-name>
+        <group-as name="tests" in-json="ARRAY"/>
+      </assembly>
+      <assembly ref="testing-scenario" max-occurs="unbounded">
+        <group-as name="testing-scenarios" in-json="ARRAY"/>
+      </assembly>
       <assembly ref="defined-component" max-occurs="unbounded">
         <use-name>component</use-name>
         <group-as name="components" in-json="ARRAY"/>
@@ -118,6 +130,7 @@
       <assembly ref="control-implementation" max-occurs="unbounded">
         <group-as name="control-implementations" in-json="ARRAY"/>
       </assembly>
+
       <!--
          <assembly ref="configuration" max-occurs="unbounded">
            <group-as name="configurations" in-json="BY_KEY" />
@@ -375,6 +388,9 @@
       <assembly ref="statement" max-occurs="unbounded">
         <group-as name="statements" in-json="ARRAY"/>
       </assembly>
+      <assembly ref="rule-implementation" max-occurs="unbounded">
+        <group-as name="rule-implementations" in-json="ARRAY"/>
+      </assembly>
       <field ref="remarks" in-xml="WITH_WRAPPER"/>
     </model>
     <constraint>
@@ -429,6 +445,9 @@
       <assembly ref="responsible-role" max-occurs="unbounded">
         <group-as name="responsible-roles" in-json="ARRAY"/>
       </assembly>
+      <assembly ref="rule-implementation" max-occurs="unbounded">
+        <group-as name="rule-implementations" in-json="ARRAY"/>
+      </assembly>
       <field ref="remarks" in-xml="WITH_WRAPPER"/>
     </model>
     <constraint>
diff --git a/src/metaschema/oscal_rules-common_metaschema.xml b/src/metaschema/oscal_rules-common_metaschema.xml
new file mode 100644
index 0000000000..87f5299748
--- /dev/null
+++ b/src/metaschema/oscal_rules-common_metaschema.xml
@@ -0,0 +1,105 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<METASCHEMA xmlns="http://csrc.nist.gov/ns/oscal/metaschema/1.0" abstract="yes">
+    <schema-name>OSCAL Rules -- Common Modules</schema-name>
+    <schema-version>1.2.0</schema-version>
+    <short-name>oscal-rules-common</short-name>
+    <namespace>http://csrc.nist.gov/ns/oscal/1.0</namespace>
+    <json-base-uri>http://csrc.nist.gov/ns/oscal</json-base-uri>
+    <remarks>
+        <p>TODO</p>
+    </remarks>
+    <import href="oscal_metadata_metaschema.xml"/>
+    <define-assembly name="rule-definition">
+        <formal-name>Rule Definition</formal-name>
+        <description>TODO</description>
+        <define-flag name="uuid" required="yes" as-type="uuid">
+            <formal-name>Rule Definition Universally Unique Identifier</formal-name>
+            <description>TODO</description>
+        </define-flag>
+    </define-assembly>
+    <define-assembly name="test-definition">
+        <formal-name>Test Definition</formal-name>
+        <description>TODO</description>
+        <define-flag name="uuid" required="yes" as-type="uuid">
+            <formal-name>Test Definition Universally Unique Identifier</formal-name>
+            <description>TODO</description>
+        </define-flag>
+    </define-assembly>
+    <define-assembly name="testing-scenario">
+        <formal-name>Rule Testing Scenario</formal-name>
+        <description>A rule testing scenario</description>
+        <use-name>scenario</use-name>
+        <define-flag name="uuid" required="yes" as-type="uuid">
+            <formal-name>Testing Scenario Universally Unique Identifier</formal-name>
+            <description>TODO</description>
+        </define-flag>
+        <model>
+            <assembly ref="rule-condition" min-occurs="1">
+                <use-name>condition</use-name>
+            </assembly>
+        </model>
+    </define-assembly>
+    <define-assembly name="rule-condition">
+        <formal-name>Rule Condition</formal-name>
+        <description>A rule implementation condition</description>
+        <define-flag name="operator" required="yes" as-type="token">
+            <formal-name>Rule Condition Operator</formal-name>
+            <description>TODO</description>
+            <constraint>
+                <allowed-values allow-other="no">
+                    <enum value="and">and</enum>
+                    <enum value="or">or</enum>
+                    <enum value="not">not</enum>
+                </allowed-values>
+            </constraint>
+        </define-flag>
+        <model>
+            <assembly ref="rule-condition">
+                <use-name>pre-condition</use-name>
+            </assembly>
+            <choice>
+                <assembly ref="rule-condition">
+                    <use-name>condition</use-name>
+                </assembly>
+                <define-assembly name="test-reference" min-occurs="1" max-occurs="unbounded">
+                    <formal-name>Test Reference</formal-name>
+                    <description>TODO</description>
+                    <define-flag name="uuid" required="yes" as-type="uuid">
+                        <formal-name>Test Reference Universally Unique Identifier</formal-name>
+                        <description>TODO</description>
+                    </define-flag>
+                    <define-flag name="test-uuid" required="yes" as-type="uuid">
+                        <formal-name>Test Universally Unique Identifier Reference</formal-name>
+                        <description>A test UUID reference</description>
+                    </define-flag>
+                </define-assembly>
+            </choice>
+        </model>
+    </define-assembly>
+    <define-assembly name="rule-implementation">
+        <formal-name>Rule Implementation</formal-name>
+        <description>TODO</description>
+        <define-flag name="uuid" required="yes" as-type="uuid">
+            <formal-name>Rule Implementation Universally Unique Identifier</formal-name>
+            <description>TODO</description>
+        </define-flag>
+        <model>
+            <define-assembly name="testing-scenario-reference">
+                <formal-name>Testing Scenario Reference</formal-name>
+                <description>A reference to a testing scenario.</description>
+                <define-flag name="uuid" required="yes" as-type="uuid">
+                    <formal-name>Rule Reference Universally Unique Identifier</formal-name>
+                    <description>TODO</description>
+                </define-flag>
+                <define-flag name="rule-uuid" required="yes" as-type="uuid">
+                    <formal-name>Rule Universally Unique Identifier Reference</formal-name>
+                    <description>A rule UUID reference</description>
+                </define-flag>
+                <define-flag name="test-scenario-uuid" required="yes" as-type="uuid">
+                    <formal-name>Rule Universally Unique Identifier Reference</formal-name>
+                    <description>A rule UUID reference</description>
+                </define-flag>
+            </define-assembly>
+        </model>
+    </define-assembly>
+</METASCHEMA>
\ No newline at end of file